Awesome!! In my younger years I never found an interest in automobiles. Now as I'm much older my interest has changed considerably. Thank you for the great info and I will follow your Chanel.
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great explanation, cars been overheating and i noticed a hose was leaking but i was still holding a majority of my coolant, turns out my thermostat got stuck closed. thanks so much!
Check engine light came on and the code it threw could have been one of nine different things. This video helped me to diagnose the problem and I learned something in the process. Thank you!
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Thank you very much, my 2011 Kia Soul was overheating and I did not know what to check for then after watching your video I did as you said and the car was hot but that hose stayed cold and never get hot then I realized that my Thermostat was stocked on CLOSE position and never OPEN to let the water coolant to flow to the Radiator. Thank you very much and may God Bless you.
I’m really new starting out working on my own vehicles, I really enjoy it but get overwhelmed looking through so many articles trying to find what I’m looking for when I don’t even know where to start and this video was so informative for me, especially since I think I have a thermostat issue and this really makes me feel confident going in and making sure it’s the thermostat and not something else, so thank you so much for this!!
Having the same problem with you, best help is talking to people and READING THE SERVICE MANUAL, if you don't have a service manual for your car I'd recommend getting one, saved my ass more times than I can count, and if you can get part numbers for things write them down!
I hear that man. I wanna do more things myself. I get motivated and encouraged to do it but then when I get to it, I become overwhelmed. But videos like this are a huge help and by laying it out step by step, it’s easier to grasp!
@3:00 very useful!! Notes: put finger on thermostat if it stays cool, the thermostat is stuck in closed position, and not allowing coolant through. Edit*Turn on engine Leave on for five minutes
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Thank you. I have a 2001 Chevy Tracker base model that takes 30 minutes to show proper temperature on the gauge and the reading drops back to cold a bit while the engine is in idle. Definitely a thermostat stuck open.
Yes, that a pretty decent way to rule out a thermostat issue. I was kind of looking for a good way / tool to measure coolant flow to diagnose if the water pump is bad and not circulating coolant. Currently this is not an issue for me. But it's one component I don't have a tester to know for sure without removing and inspecting.
Try looping the heater inlet and outlet hoses together with clear vinyl hose. Run the engine and watch for flow. If you cant easily reach those, look for another small coolant hose you could insert a loop into. Stay gold
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After a new water pump radiator cap and 3 new thermostats, it stayed closed again. Took it out after busting a hole in both upper and lower radiator hoses. Read through 1000s of comments against doing it. Bought myself a week till my new radiator came. After putting it in the old 1 didnt look bad at all. Found a short in a fan wire which made it look like it was working coming on sometimes then off when cooled down a bit. Now they are both running and its super cold. Guess i will reinstall that dam thermostat, just letting yall know whats up. If you have too, do it and figure it out till you get it right again. 💯🔥
What happens often on older vehicles is the thermostat works fairly normal except it won't close up completely and thereby causes the engine to never make it to correct operating temperature that the computer is looking for. The idle stays fast because it thinks it's still warming up, it runs richer because it thinks it still warming up, and your heat is weak.
I changed coolant sensor on my son's 07 HHR now it runs so rough and gave a upstream 02 sensor 😡🙄 hate hate hate this crap dealt w a Chrysler 300M nothing but electrical/sensor after sensor was fixing to replace brain and boom timing jumped and screwed some internal crap!!
Time for horse n buggy or a tri-motorized bicycle w enclosed cabin some solar panels and batteries converter/inverter run some lights and a small heater and be done w crap!!! Lol
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Another indicator is the temperature gauge itself. Stuck open, the temp gauge will take a very long time to rise. Stuck closed, the temp will rise to operating temp normally but then just continue to rise towards the red zone.
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Thank you. I never had these issues with my 99 camry but this 97 camry I am. After ther thermostat failed, I disconnected the fans from the ect to keep the engine cool till I got it fixed but now a week later after getting it fixed, the gasket failed and was leaking bad. Also i never see the gauge go up but i see the white smoke from under the hood first. Had to take the car back and the guy reinstalled a new gasket on the thermostat and did every test he could. Swore the ect was working and the fans were coming on like they should. But even now as I am sitting idling after dropping off my sister, the car started smoking again which immediately had me worried so I bypassed the switch to let the fans run to keep my car cool. The mechanic said if it does it again he will take it to Toyota himself😅 cause he even had the Toyota mechanic on the phone showing him what he was doing.
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Just installed a new thermostat in a 2018 jeep grand Cherokee V6 3.6l. first auto repair I've ever done. This helps and I'm gonna run this test in the morning. Any tips on how to burp this specific cooling system?
The other way to check Thermostat is open Radiator cap (Cold) & start, when it gets warm enough the coolant will move across because the thermostat opened. - If when you start the engine with it open & the coolant comes out, you could have a blown head gasket !
Hi Louis, I dont get it. You mean if I open radiator cap, turn on car and wait and see if coolant overflows or move across? What do you mean with across? Doesnt it overflow regardless? I am interested to know if my thermostat works or not. Thanks Sir.
The car could if it's winter it thinks it blows cold automatic and manual transmission are fitted with antiskid and room temperature electronics but for this issue an auto electrician can check the block in two places to rule out heater core ruptions so if comes hot after the heater is blocked no power to the circuit , lastly mine came hot afterwards but service the car it can happen if you run for codes also a non code is an check light if coolant is the service check the auto electrical parts that should light up and the parts working properly, not sure if you have a car diagnostic but everything to the block changes if it's not cool , in winter it's cold enough but summer like car temperatures need to manipulate the combustion to quick or slowly when it's none you have no fuel in the tank if your asking does it take place after warm up check if you get to warm also in 🕞 nutes
Great explanation! My Ford kuga diesels’ temperature gauge gets to 90 degrees in 2 mins even at 7 degrees .. I’m still trying to figure it out but this video has given me a good basic understanding of how it all works 👏👏
@@kevinhancock4064 Thank you. I am going to change my thermostat. Eventually change the pump. I changed all the hoses and radiator cap. After I change the thermostat then I am going to change repair shop. Thank you for assistance
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Great thanks, I just changed / flushed my coolant & now my temp gauge is not going up & the fan doesnt seem to be kicking in. Top rad hose is getting very hot & steaming though. Any thoughts?
Question: on a 2014 Passat 1.8T (ETKA). Upper radiator hose gets hot and tight (barely compressible). Raditatior has a leak and both the primary and secondary fans are not cycling on. Radiator will be replaced, along with upper and lower coolant hoses, both coolant sensors, thermostat, along with heater core. All was original, and I have the interior taken apart anyway, might as well. Anything that I might be forgetting? Another mechanic said to wait before replacing the fans; suggested that the coolant sensor that sends the signal for the fan to come on may be faulty and to wait before spending the money. The entire fan assembly can be easily replaced without draining the coolant (4 screws and 2 electrical connectors and it lifts up and out). Your thoughts?
Here's a more accurate way of testing if your thermostat is working properly. Verify what the rating is on your thermostat is (195 degrees is common). Connect almost any cheap or expensive OBDII scan tool and take the car out on the highway. If the OBDII coolant temp runs up to the rating on the thermostat and stabilizes there your good to go. In one case I had a dash temp gauge that was reading 3/8 on the gauge (1/2 would be common). I wanted to know what the computer was seeing and it was reading about 10 degrees over the thermostat's rating. Dodge manuals indicate that thermostats are more likely to fail closed rather than open. I bought a NAPA thermostat. When I pulled the old thermostat (I could tell it had never been changed because the way Dodge staked it at the factory) I put both in a pan and brought it to boil. The new thermostat opened exactly at 195 degrees where the old one stayed shut. I put in the new thermostat and low and behold the OBDII coolant temp driving down the road was 195-197, a full 10 degrees cooler than the old thermostat. It's also possible to have a bad coolant temp sensor, in which case changing the thermostat would have no effect. In that case you would want to change the sensor after verifying the thermostat is working properly.
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Good video. I have the thermostat and water pump ready to replace, but cross my fingers it's just the thermostat...either way thanks for video....worth a long shot...even if it's Murphy's law that wins out.
Outside temp -10 C. After starting and idling the engine for 14 (!) minutes, the temp gauge finally shows nominal temperature. During that time the pipe gradually builds up to a comfortable level, like 40C. Never really hot. During drive the temperature keeps falling down below nominal temperature, eften after driving for 30 minutes. Suspecting a stuck open.... What do you think?
Yes, a common cause for the engine not getting up to it's full proper working tempurature can often be the thermostat stuck open. This essentially stops the coolant from being held in the engine and getting up to temp (when usually the thermostat would open). Instead, it is constantly circulating and getting coolect by the radiator and fan. Definitely worth replacing the thermostat as the cost is low and the likelihood of success is high - that's the good way around! www.paypal.me/youwrench --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
Great video, very helpful and simple process. My issue is the temperature gauge goes straight to hot/normal running temperature soon as I start the van. Could this be the Thermostat or maybe the temperature Sensor?
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Been fighting my heater in my 96 Ford F150, replaced the heater core thinking it was that because one of the two lines going into it would get warm, but the other did not. Starting to think my thermostat is stuck open. The radiator hose gradually gets warm, not a cold to hot scenario and when I start it with the radiator cap off it instantly starts to push fluid up. Going to replace it next week. Thanks for the info!
Yes, a sign that the upper radiator hose does not go from cold to extremely hot when the thermostat first opens is indeeda thermostat being stuck open. Often with this issue you will also find that the hot air inside the cabin does not get very hot, because the coolant is never getting to full operating temperature, and so it cannot create nice hot air in the cabin via the heater matrix. Hope you get it sorted soon! :-) --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
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I encountered an issue with my Audi A3 the other day. Basically I was pulling into a highway after about 20 minutes of driving, and I noticed that the temperature gauge started dropping from 90 degrees and eventually down to 50 degrees... While driving down a highway which makes little sense. Granted it was a cold day out at around -8 degrees celsius, but surely the ambient temperature and the draft from the high speeds couldn't possibly be enough to cool down a running engine that much can it?
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Absolutely the most concise, and understandable explanation of the two modes of failure with the thermostat. My S5 thermostat failed in the closed position, engine gets up to 115c per OBD live data, fans kick in full tilt... Yet both ends of the radiator are cold indicating no flow through it.
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When i drive on the highway the gage of temperature going up and when i turn on the heat the gage of temperature goin down to the right position, what’s meant that?
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Thank you, my ford it doesn't heat up unless I'm uphill and after drops again. Is temperature sensor or how you said thermostat? If i cover the radiator would help heat up?
Great videos, thank you so much! I have a question for you. What does it mean when I my heater is not producing any heat, and also I've noticed that the radiator fan does not turn on when the engine gets to temperature? I am suspecting a bad heater core but I would like to see if it could be something else first. The hoses going to the heater core are hot, and also would like to add that both fans turn on when I turn on the AC. - heater not hot, only blows cool air - rad fan not turning on - fans turn on with AC but not with only the heater - heater core hoses do get hot - upon starting the vehicle, there is a humming noise coming from the dash board for about 15 seconds Thank you
Thank you! It could be something as simple as the flap motor that controls the distribution between hot and cold into the cabin has broken. Can you hear the motor turning when you switch between full hot to full cold/vice versa? Also, the radiator fan may not kick in when the car reaches operating temurature. Often it takes a quite a bit longer when just idling. It will come on much quicker when driving, but of course you would not notice this (without live diagnostic data at least). If you leave the car idling for long enough though it should come on eventually (will take longer in cold weather too). Just don't expect it to kick in as soon as the temp hits the middle of the gauge. Hope that helps 👍 ----------------------------------------------- To help support us: 1) Please be sure to use our Amazon Links! 2) Please ensure you LIKE our video's, and SUBSCRIBE to our channel! 3) Donations always welcome! Hit the SUPER THANKS option below the video on RUclips, or by PayPal: www.paypal.me/youwrench Thank you for your support!
Alright, my toyota harrier 2003 3.0L (1mzfe ) has been overheating once i drive it a bit harsh, it doent overheat upon normal conditions. This may be helpful, i already cleared out the radiator and gasket problems, praying this will fix the issue. Thank you!
Upper hose gets hot few mins after starting the engine like u mentioned..buy my lower hose isnt hot..is tat normal?..cuz i have an optima k5 tat has thermostat located at the end of the lower hose..TQ~
Hi, thanks for the video. I have a 2009 Honda Ody. My problem is that the engine fans won't turn on. I already checked the fuses, replaced both engine coolant temp sensors and both relays. On the dashboard, the indicator is at zero when the engine is cold, when it starts to warm up it goes up to the middle, but it never goes beyond there. But using a little bluethoot scanner I see the temperature go up to 210 F and even higher. But the fans don't turn on. When I put a paper clip in place of the relays, the fans work and the temperature returns to a normal temperature (170 F) on the bluetooth scanner, but on the dash it is always in the middle. Why won't the fans turn on if I change the relays and sensors, the fans are working and not damaged. Do you think I need to replace the thermostat as well?
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An explanation I read for my Volkswagen Touareg was that there’s an upper and lower pipe and that both should get hot, but if the upper one gets hot and the lower one doesn’t there’s a problem
Interesting! Normally the lower pipe will not be as hot as the upper because the lower is passing the cooled coolant that has just passed through the radiator back into the bottom of the engine for recirculation. Maybe it's a different system, or a system variant. --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
Good video. From the video I'm presuming my thermostat might be stuck in closed position. I recently had an overheating that has me confused. Warning bell started and I saw my temp gauge pegged at max heat. Pulled over and tried adding coolant by expansion tank (on driver's side) but it barely took any. Temp still pegged. Tried removing the rad cap and saw rad was empty. Explains why motor overheated but why wouldn't the cooling system accept coolant by expansion tank. Any thoughts for me to check?
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Oh wow this is very interesting because I've been driving my car in the past couple days when driving it for a bit it feels like it wants to cut off and then when it gets a chance it will usually I'm backing up or I had just parked... Now on my dashboard it would tell me when it had started to overheat but the past few months I haven't had no issues... But now I am
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Hi from Puerto Rico! Since we in my island is very mostly hot... Can I remove the thermostat in a 2003 Nissan Murano 3.5L? By the way I did in the past in a Mitsubishi Montero Sport 1999 and it works very well.
So should the top hose go back and forth from cold and hot momentarily? And should the bottom hose stay cool? Bottom is not even warm. Does the radiator cool it that much and that fast? I've been using the heater running on full blast to help with keeping the engine from over heating but that only works to a certain extent. Definitely helps but during the day when it's hottest it's risky. Replaced water pump and still overheating. When driving after warming up a bit it takes a while for the gauge to go pass the middle, longer if I have the heater on beforehand. Uphill definitely gets it really close to the red zone and overheating alert. Never actually got all the way in the red zone but super close. At idle at stop lights or parked with heater on gradually gets the gauge back down towards or at middle. Thinking my radiator is clogged. Went for a drive long enough to get the gauge needle to go a little past the middle to about 80% and use a infrared thermometer to measure the temp on the radiator and it seems like the far right side top corner was about 10° higher. Any clue? Thanks
Thank for your video my car's temperature gauge is in the stays bared in cold, engine light is on. So if hold the upper hose 5-10 minutes it should suddenly get hot. If the thermostat is stuck open it just gradually get warmer? I just want to make sure before replacing the thermostat that it is not just a bad ECT sensor.
Yes, a very strong indicator that your thermostat is bad is that the top hose will not suddenly go from cold to red hot as the thermostat opens and floods the pipe with hot coolant. If it is stuck open then it will never get as hot as it should, only warm, as the 'cycle' is constantly open so it's always flowing through the radiator and being cooled, in these cases you usually also can't get decent hot air inside the cabin as the coolant is never getting as hot as it should. On many cars a new thermostat is $15-30 and so this is often the best place to start if you suspect it's a likely cause. Other cars they can be very expensive though!! If it's cheap for your car, it's a safe bet if only to rule it out. Hope that helps :-) --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
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And if I'm not mistaken if the thermostat is stuck open your temp gauge will show cooler than normal and your heater will not blow hot as usual and be maybe lukewarm.
Yes, absolutely. If your thermostat is stuck open then the coolant is not held in the engine and will just keep circulating through the radiator, so it will not be able to get up to a proper operating temperature. So when you call for heat inside the cabin there will be no heat (or very little) to give as the coolant is not up to temperature. So if you get a combinaition of no warmth inside the cabin coupled with the temperature gauge always sitting low, then this is a good indicator of a faulty thermostat (open). Hope that helps! :-) --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
Very good explanation without a doubt. Can you please tell is there any harm in using a thermostat that opens up at a lower temperature than the factory, during very hot summer months with ac on?
Thank you! Hard to say, provided it's keeping the engine cool at it's required temperature then in theory it could be ok. That said, if it's doing that due to a possible thermostat fault then don't risk it, just replace it. It's easy and the thermostat is very cheap too (check out the Amazon link in the descriptive text of the video for the best deal!) --- To help support us (for both you and others reading this) there are a few things you can do: 1) Donations both needed and welcome! We cannot operate You Wrench without the support of people like you! You can donate by PayPal - just go to www.paypal.me/youwrench 2) Please ensure you subscribe to our RUclips channel. 3) Please Like our video's on RUclips (by clicking Like!) 4) Please help spread the word, the more people who know about us the better! Add links to our video's in forums, let people know about us. Thank you for your support!
Having a thermostat stuck open will not cause immediate damage, but can cause issues over time if left unfixed. The main thing you will likely see is in the winter the cars heat will not work well (will take forever to heat up, and then will likely not blow as hot when you are driving fast on interstates and highways). That can be annoying but the damage can come overtime since the engine is not getting to the proper operating temperature it was designed to operate at. The car will adjust the air to fuel ratio putting more fuel in (running rich when engine is cold) and can cause carbon build up and more wear on injectors. The engine oil will also not be getting up to the proper temperature and will not lubericate as well as it would at operating temperature. So to sum up, if you live in a warm climate and it is stuck open you will likely not have any issues other than a potential check engine light. If you are in a cold climate your heat will not work as it should, and you will put additional wear on the engine over time.
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Another way is to touch the bottom radiator hose. If the top hose is hot and the bottom hose is cold, then the thermostat is stuck in the closed position. If the bottom hose is hot once the engine has reached operating temperature, then the thermostat is operating correctly. If the top and bottom hoses are heating up at the same pace, then the thermostat is stuck in the open position.
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As a young lady, I do make every attempt to educate myself about my car and other things. This was a very easy video to understand! If it's this easy to determine condition of a thermostat, then why do the Jag dealership charge a lot to check them out and exaggerate the amount of time the diagnostic takes? I'm just curious! I will be taking it in soon because, apparently, there's a thermostat issue. Blah. I just replaced the water pump last year, June 2022! Vehicle specs: 2017 xe 25t 39,000 gas 2.0 base Regularly maintenanced for the last 5 yrs at the dealership! Miffed right now about this thermostat concern. 🙄 Miffed last year about replacement of water pump! Suggestions and comments are welcomed! Thank you, sir!
So they can make money !!😅 Your dealer would just connect it to their scanner first, they wouldn't do a manual test like this... 😂 As someone else has posted.. get a Bluetooth OBD2 (OBDII) scanner from your local automotive store and torque pro app and connect to your mobile phone... cost you less than $50 (Since you want to learn)... potentially save you lots of money. Since you already suspect thermostat problems.. NEVER go to a dealership who charge an arm and a leg - go to a local mechanic....(caveat !!) BUT who knows your type of car.
I have a Vivaro Diesel and just had the water pump changed, now I cant get rid of air from the system by bleeding it as it keeps pressurising. I suspect a cylinder head problem solely because the water pump has been changed but there is no white smoke, no sign of moisture on the oil filler cap and no bubbles in the bottle. Could it be just the thermostat? The van heater only blows cold and occasionally warm but not hot. My local garage suspect a cylinder head gasket but won't take the work on because they say removing the injectors is too difficult. They suggest scrapping it but the van is in great condition otherwise. Is it common for air to be ingested into the cooling system even though there is no obvious sign of a leak?
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There is another issue that happens every 10 years on my truck. Air builds up in the top hose and stops the heater from working in the cab. Only cold air comes out of the vents. Each time this happens I loosen the over fill tank cap and burp the top radiator hose while the engine is running. By decompressing the top hose over and over you will see the over fill tank coolant level move up and down. Once the air is removed, heat in the cab will be restored. Just like hot water boilers in a home, air in a system causes no coolant to reach the heater core fins.
If this was happening, would it also cause the heat gauge to start to rise and get hotter? Just trying to key doen exactly what the action and reactions are and this made me ponder that haha
Awesome!! In my younger years I never found an interest in automobiles. Now as I'm much older my interest has changed considerably. Thank you for the great info and I will follow your Chanel.
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You explained this in a proper sequence and taught me something. Thank you. And you got right to it without any extra talking bits
great explanation, cars been overheating and i noticed a hose was leaking but i was still holding a majority of my coolant, turns out my thermostat got stuck closed. thanks so much!
Check engine light came on and the code it threw could have been one of nine different things. This video helped me to diagnose the problem and I learned something in the process. Thank you!
Excellent!! Glad we could help out and that you're back on the road again!
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I’ve just watch multiple videos on the topic to compare and contrast. This was by far the best video in terms of thoroughness and attention to detail.
Difference between a pro explaining it and hobbyists explain based on their limited knowledge.
Difference between a pro explaining it and hobbyists explain based on their limited knowledge.
Thank you very much, my 2011 Kia Soul was overheating and I did not know what to check for then after watching your video I did as you said and the car was hot but that hose stayed cold and never get hot then I realized that my Thermostat was stocked on CLOSE position and never OPEN to let the water coolant to flow to the Radiator. Thank you very much and may God Bless you.
I’m really new starting out working on my own vehicles, I really enjoy it but get overwhelmed looking through so many articles trying to find what I’m looking for when I don’t even know where to start and this video was so informative for me, especially since I think I have a thermostat issue and this really makes me feel confident going in and making sure it’s the thermostat and not something else, so thank you so much for this!!
Get used to it.
Having the same problem with you, best help is talking to people and READING THE SERVICE MANUAL, if you don't have a service manual for your car I'd recommend getting one, saved my ass more times than I can count, and if you can get part numbers for things write them down!
I hear that man. I wanna do more things myself. I get motivated and encouraged to do it but then when I get to it, I become overwhelmed. But videos like this are a huge help and by laying it out step by step, it’s easier to grasp!
@@Colehallen thank you so much
@@ReformedTradesman I couldn’t of said it better, these videos are a life saver! Especially for a girl like me just starting out
@3:00 very useful!!
Notes: put finger on thermostat if it stays cool, the thermostat is stuck in closed position, and not allowing coolant through.
Edit*Turn on engine
Leave on for five minutes
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Save me time how to find whether my thermostat working or not, good explanation.
Perfect, glad we could help you out :-)
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Thank you. I have a 2001 Chevy Tracker base model that takes 30 minutes to show proper temperature on the gauge and the reading drops back to cold a bit while the engine is in idle. Definitely a thermostat stuck open.
Yes, that a pretty decent way to rule out a thermostat issue. I was kind of looking for a good way / tool to measure coolant flow to diagnose if the water pump is bad and not circulating coolant. Currently this is not an issue for me. But it's one component I don't have a tester to know for sure without removing and inspecting.
If your pump is on its way out, you'll see the temp gauge running hot or overheat.
Try looping the heater inlet and outlet hoses together with clear vinyl hose. Run the engine and watch for flow.
If you cant easily reach those, look for another small coolant hose you could insert a loop into.
Stay gold
Yes as you indicated this actually doesn’t differentiate between thermostat issues, water pump issues and blockage in flow
Will this cause a coolant leak also
Car will start making certain noises pump might start whinging
Thank you so much for explaining how it actually works instead of just spraying it out with the hose I appreciate it thank you
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Brilliant. Now I can go outside and do the test. Thank you for the awesome video.
After a new water pump radiator cap and 3 new thermostats, it stayed closed again. Took it out after busting a hole in both upper and lower radiator hoses. Read through 1000s of comments against doing it. Bought myself a week till my new radiator came. After putting it in the old 1 didnt look bad at all. Found a short in a fan wire which made it look like it was working coming on sometimes then off when cooled down a bit. Now they are both running and its super cold. Guess i will reinstall that dam thermostat, just letting yall know whats up. If you have too, do it and figure it out till you get it right again. 💯🔥
What happens often on older vehicles is the thermostat works fairly normal except it won't close up completely and thereby causes the engine to never make it to correct operating temperature that the computer is looking for.
The idle stays fast because it thinks it's still warming up, it runs richer because it thinks it still warming up, and your heat is weak.
Change your coolant temperature sensor
I changed coolant sensor on my son's 07 HHR now it runs so rough and gave a upstream 02 sensor 😡🙄 hate hate hate this crap dealt w a Chrysler 300M nothing but electrical/sensor after sensor was fixing to replace brain and boom timing jumped and screwed some internal crap!!
Time for horse n buggy or a tri-motorized bicycle w enclosed cabin some solar panels and batteries converter/inverter run some lights and a small heater and be done w crap!!! Lol
THANKS! You teach well. Some can DO, but cannot teach (on sooo many videos).
Thank you! :-)
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Very helpful. Now I figure out why my Golf is actually not heating up very well. Thanks.
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This was extremely helpful and very well explained. Thank you
Awesome, gla dto hear you found it useful, and thanks for your support! :-)
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6:56
Another indicator is the temperature gauge itself. Stuck open, the temp gauge will take a very long time to rise. Stuck closed, the temp will rise to operating temp normally but then just continue to rise towards the red zone.
Thank you, that is another way to look at it too while sitting behind the steering wheel.
Mine never moves
@@alexapexgod4643 You need a new Coolant Temperature Sending Unit sensor and a telfon tape.
Terrific explanation! Very detailed and easy to understand for a novice like myself!
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Thank you. I never had these issues with my 99 camry but this 97 camry I am. After ther thermostat failed, I disconnected the fans from the ect to keep the engine cool till I got it fixed but now a week later after getting it fixed, the gasket failed and was leaking bad. Also i never see the gauge go up but i see the white smoke from under the hood first. Had to take the car back and the guy reinstalled a new gasket on the thermostat and did every test he could. Swore the ect was working and the fans were coming on like they should. But even now as I am sitting idling after dropping off my sister, the car started smoking again which immediately had me worried so I bypassed the switch to let the fans run to keep my car cool. The mechanic said if it does it again he will take it to Toyota himself😅 cause he even had the Toyota mechanic on the phone showing him what he was doing.
Now, why didn't I think of that?! You're a genius! 👍🏻
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This really helped me. Thank you
Very helpful as my bolts are to rusted to remove the thermostat to my heat exchanger, so this method is all I got! Thanks
The best simplest way explained simple and great information. 😎
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Thank you ! You explained it BRILLIANTLY!!! Very helpful!!!
Just installed a new thermostat in a 2018 jeep grand Cherokee V6 3.6l. first auto repair I've ever done. This helps and I'm gonna run this test in the morning. Any tips on how to burp this specific cooling system?
Fantastic information, Sir!!! Awesome video and very clear explanation of how everything works!!! 11 stars out of ten!!
Thanks! Given a 173$ quote for thermostat replacement. Gonna see if I can figure it out myself..
The other way to check Thermostat is open Radiator cap (Cold) & start, when it gets warm enough the coolant will move across because the thermostat opened. - If when you start the engine with it open & the coolant comes out, you could have a blown head gasket !
Hi Louis, I dont get it. You mean if I open radiator cap, turn on car and wait and see if coolant overflows or move across? What do you mean with across? Doesnt it overflow regardless? I am interested to know if my thermostat works or not. Thanks Sir.
@@Fred-Faizi check the heating inside does it blow hot air if not then thermostat not working
@tonyxxxxxx8634 my cars heater runs cold
9
The car could if it's winter it thinks it blows cold automatic and manual transmission are fitted with antiskid and room temperature electronics but for this issue an auto electrician can check the block in two places to rule out heater core ruptions so if comes hot after the heater is blocked no power to the circuit , lastly mine came hot afterwards but service the car it can happen if you run for codes also a non code is an check light if coolant is the service check the auto electrical parts that should light up and the parts working properly, not sure if you have a car diagnostic but everything to the block changes if it's not cool , in winter it's cold enough but summer like car temperatures need to manipulate the combustion to quick or slowly when it's none you have no fuel in the tank if your asking does it take place after warm up check if you get to warm also in 🕞 nutes
Great explanation! My Ford kuga diesels’ temperature gauge gets to 90 degrees in 2 mins even at 7 degrees .. I’m still trying to figure it out but this video has given me a good basic understanding of how it all works 👏👏
Your thermostat I'd say
@@kevinhancock4064 if I turn my heater on to the cabin will that tell the thermostat is working?
@Water Fall (H2O) well yes indeed I just put a new oem in my car and new pump (not oem ) but good brand
@@kevinhancock4064 Thank you.
I am going to change my thermostat. Eventually change the pump. I changed all the hoses and radiator cap. After I change the thermostat then I am going to change repair shop.
Thank you for assistance
@Water Fall (H2O) repair shop ? Yeah nice 1 kettle me know how u get on whats your issue anyway ?
This was very helpful. I hope to solve my overheating issue on my 3.6 Durango
Glad we could help :-)
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I hit subscribe just because you've just saved me some precious time. Thanks
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Wow I never knew this until watching this video. Thanks!
Great thanks, I just changed / flushed my coolant & now my temp gauge is not going up & the fan doesnt seem to be kicking in. Top rad hose is getting very hot & steaming though. Any thoughts?
Question: on a 2014 Passat 1.8T (ETKA). Upper radiator hose gets hot and tight (barely compressible). Raditatior has a leak and both the primary and secondary fans are not cycling on. Radiator will be replaced, along with upper and lower coolant hoses, both coolant sensors, thermostat, along with heater core. All was original, and I have the interior taken apart anyway, might as well. Anything that I might be forgetting? Another mechanic said to wait before replacing the fans; suggested that the coolant sensor that sends the signal for the fan to come on may be faulty and to wait before spending the money. The entire fan assembly can be easily replaced without draining the coolant (4 screws and 2 electrical connectors and it lifts up and out). Your thoughts?
I don’t usually comment, but thank you. Very helpful! 🎉
Here's a more accurate way of testing if your thermostat is working properly. Verify what the rating is on your thermostat is (195 degrees is common). Connect almost any cheap or expensive OBDII scan tool and take the car out on the highway. If the OBDII coolant temp runs up to the rating on the thermostat and stabilizes there your good to go. In one case I had a dash temp gauge that was reading 3/8 on the gauge (1/2 would be common). I wanted to know what the computer was seeing and it was reading about 10 degrees over the thermostat's rating. Dodge manuals indicate that thermostats are more likely to fail closed rather than open. I bought a NAPA thermostat. When I pulled the old thermostat (I could tell it had never been changed because the way Dodge staked it at the factory) I put both in a pan and brought it to boil. The new thermostat opened exactly at 195 degrees where the old one stayed shut. I put in the new thermostat and low and behold the OBDII coolant temp driving down the road was 195-197, a full 10 degrees cooler than the old thermostat. It's also possible to have a bad coolant temp sensor, in which case changing the thermostat would have no effect. In that case you would want to change the sensor after verifying the thermostat is working properly.
Great video. I have a cold bottom hose after driving for 30min. Any idea why? Car takes forever to get warm. Mazda 2 2021
Absolutely brilliant video. You are a great teacher!!
Thank you, glad you found the video helpful :-)
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Clear explanation. Helpful.
Thank you :-)
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Good video. I have the thermostat and water pump ready to replace, but cross my fingers it's just the thermostat...either way thanks for video....worth a long shot...even if it's Murphy's law that wins out.
Outside temp -10 C. After starting and idling the engine for 14 (!) minutes, the temp gauge finally shows nominal temperature. During that time the pipe gradually builds up to a comfortable level, like 40C. Never really hot. During drive the temperature keeps falling down below nominal temperature, eften after driving for 30 minutes. Suspecting a stuck open.... What do you think?
Yes, a common cause for the engine not getting up to it's full proper working tempurature can often be the thermostat stuck open. This essentially stops the coolant from being held in the engine and getting up to temp (when usually the thermostat would open). Instead, it is constantly circulating and getting coolect by the radiator and fan. Definitely worth replacing the thermostat as the cost is low and the likelihood of success is high - that's the good way around! www.paypal.me/youwrench
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Great video, very helpful and simple process. My issue is the temperature gauge goes straight to hot/normal running temperature soon as I start the van. Could this be the Thermostat or maybe the temperature Sensor?
Excellent video, thank for the clear advice and info.
Beautiful Logic and presentation.
Thank you!
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Who here cause they ain’t trynna pay them shop prices 😂
I know I bout fell out my chair I seen some prices
@@jonathanbaugher6051I got it off just now on my daughters 07 marano wasn't hard but the shop trying to knock you over the head lol
You truly are uneducated aren’t you? Bless your heart
Yup,I ain’t paying $500 for an easy fix
Sadly this didn't solve the problem
Thank you very much! This is a really good explanation and I enjoyed listening. 👍
Thank you, we appreciate that :-)
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Been fighting my heater in my 96 Ford F150, replaced the heater core thinking it was that because one of the two lines going into it would get warm, but the other did not. Starting to think my thermostat is stuck open. The radiator hose gradually gets warm, not a cold to hot scenario and when I start it with the radiator cap off it instantly starts to push fluid up. Going to replace it next week. Thanks for the info!
Yes, a sign that the upper radiator hose does not go from cold to extremely hot when the thermostat first opens is indeeda thermostat being stuck open. Often with this issue you will also find that the hot air inside the cabin does not get very hot, because the coolant is never getting to full operating temperature, and so it cannot create nice hot air in the cabin via the heater matrix. Hope you get it sorted soon! :-)
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Very clear and precise. Thank you very much 👍
Very helpful, detailed.
Thank you 👍
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I encountered an issue with my Audi A3 the other day.
Basically I was pulling into a highway after about 20 minutes of driving, and I noticed that the temperature gauge started dropping from 90 degrees and eventually down to 50 degrees... While driving down a highway which makes little sense.
Granted it was a cold day out at around -8 degrees celsius, but surely the ambient temperature and the draft from the high speeds couldn't possibly be enough to cool down a running engine that much can it?
Good evening Thank you for your efforts and appreciation for this information and for this valuable information about the car, Dodge Grand Caravan.
perfect explanation and demonstration
Thank you! 👍
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I have a jeep compass 2007 and the coolant tank starts to boiling very hot is that signs of bad thermostat or bad senor ?
Thank you for the great detailed explanation! Just what I needed to hear to diagnose my vehicle.
Glad we could help :-)
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@@YouWrench😊
Absolutely the most concise, and understandable explanation of the two modes of failure with the thermostat.
My S5 thermostat failed in the closed position, engine gets up to 115c per OBD live data, fans kick in full tilt... Yet both ends of the radiator are cold indicating no flow through it.
Thank you! :-)
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Man you're awesome. I wondered the thermostat worked like that but hearing from you really narrows it for me! Thanks!!
When i drive on the highway the gage of temperature going up and when i turn on the heat the gage of temperature goin down to the right position, what’s meant that?
Awesome Video the ONLY one that explains how a Thermostat works! Excellent imfo ..Thank You so much the first round of drinks are on Me! lol
Glad you found the video helpful, and thank you for your support!
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Very helpful and very well explained. Thank you
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Thank you, my ford it doesn't heat up unless I'm uphill and after drops again. Is temperature sensor or how you said thermostat? If i cover the radiator would help heat up?
Great videos, thank you so much!
I have a question for you. What does it mean when I my heater is not producing any heat, and also I've noticed that the radiator fan does not turn on when the engine gets to temperature?
I am suspecting a bad heater core but I would like to see if it could be something else first.
The hoses going to the heater core are hot, and also would like to add that both fans turn on when I turn on the AC.
- heater not hot, only blows cool air
- rad fan not turning on
- fans turn on with AC but not with only the heater
- heater core hoses do get hot
- upon starting the vehicle, there is a humming noise coming from the dash board for about 15 seconds
Thank you
Thank you! It could be something as simple as the flap motor that controls the distribution between hot and cold into the cabin has broken. Can you hear the motor turning when you switch between full hot to full cold/vice versa? Also, the radiator fan may not kick in when the car reaches operating temurature. Often it takes a quite a bit longer when just idling. It will come on much quicker when driving, but of course you would not notice this (without live diagnostic data at least). If you leave the car idling for long enough though it should come on eventually (will take longer in cold weather too). Just don't expect it to kick in as soon as the temp hits the middle of the gauge. Hope that helps 👍
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Alright, my toyota harrier 2003 3.0L (1mzfe ) has been overheating once i drive it a bit harsh, it doent overheat upon normal conditions. This may be helpful, i already cleared out the radiator and gasket problems, praying this will fix the issue. Thank you!
Upper hose gets hot few mins after starting the engine like u mentioned..buy my lower hose isnt hot..is tat normal?..cuz i have an optima k5 tat has thermostat located at the end of the lower hose..TQ~
Hi, thanks for the video. I have a 2009 Honda Ody. My problem is that the engine fans won't turn on. I already checked the fuses, replaced both engine coolant temp sensors and both relays. On the dashboard, the indicator is at zero when the engine is cold, when it starts to warm up it goes up to the middle, but it never goes beyond there. But using a little bluethoot scanner I see the temperature go up to 210 F and even higher. But the fans don't turn on. When I put a paper clip in place of the relays, the fans work and the temperature returns to a normal temperature (170 F) on the bluetooth scanner, but on the dash it is always in the middle. Why won't the fans turn on if I change the relays and sensors, the fans are working and not damaged. Do you think I need to replace the thermostat as well?
Having the same issue on my crx !!! Going to change thermostat soon hope that’s the issue
@@g35tho11 Thank you, I already did it, but the issue still there. I think something is wrong with the ECU or something else.
If you bypassed the relays its probably something out of the relays
Good video. Love the green gloves.
Thank you, and thank you, Jesus! :-)
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An explanation I read for my Volkswagen Touareg was that there’s an upper and lower pipe and that both should get hot, but if the upper one gets hot and the lower one doesn’t there’s a problem
Interesting! Normally the lower pipe will not be as hot as the upper because the lower is passing the cooled coolant that has just passed through the radiator back into the bottom of the engine for recirculation. Maybe it's a different system, or a system variant.
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Good video. From the video I'm presuming my thermostat might be stuck in closed position. I recently had an overheating that has me confused. Warning bell started and I saw my temp gauge pegged at max heat. Pulled over and tried adding coolant by expansion tank (on driver's side) but it barely took any. Temp still pegged. Tried removing the rad cap and saw rad was empty. Explains why motor overheated but why wouldn't the cooling system accept coolant by expansion tank. Any thoughts for me to check?
Sound like u need a new radiator cap. Or there is a leak in the system that has lower pressure than the expansion tank.
Love it mate. Thank you so much that was very helpful
Thank you :-)
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Good explanation. I like that. Thanks.
Thank you very much!! :-)
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Oh wow this is very interesting because I've been driving my car in the past couple days when driving it for a bit it feels like it wants to cut off and then when it gets a chance it will usually I'm backing up or I had just parked... Now on my dashboard it would tell me when it had started to overheat but the past few months I haven't had no issues... But now I am
Super helpful video thank you!
brilliant explanation, the Lord bless you.😇
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This guy’s awesome! I love low tech troubleshooting.
Thank you, that's very much appreciated!
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Thanks for the clear explanation.
Thank you!
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Hi from Puerto Rico! Since we in my island is very mostly hot... Can I remove the thermostat in a 2003 Nissan Murano 3.5L? By the way I did in the past in a Mitsubishi Montero Sport 1999 and it works very well.
So should the top hose go back and forth from cold and hot momentarily? And should the bottom hose stay cool? Bottom is not even warm. Does the radiator cool it that much and that fast?
I've been using the heater running on full blast to help with keeping the engine from over heating but that only works to a certain extent. Definitely helps but during the day when it's hottest it's risky. Replaced water pump and still overheating. When driving after warming up a bit it takes a while for the gauge to go pass the middle, longer if I have the heater on beforehand. Uphill definitely gets it really close to the red zone and overheating alert. Never actually got all the way in the red zone but super close.
At idle at stop lights or parked with heater on gradually gets the gauge back down towards or at middle. Thinking my radiator is clogged. Went for a drive long enough to get the gauge needle to go a little past the middle to about 80% and use a infrared thermometer to measure the temp on the radiator and it seems like the far right side top corner was about 10° higher. Any clue?
Thanks
Mine Camry is doin same thing u ever dig it out
Thanks! question :) if the Thermostat is no problem, but the water bump stop work, what it looks like?
Thank for your video my car's temperature gauge is in the stays bared in cold, engine light is on. So if hold the upper hose 5-10 minutes it should suddenly get hot. If the thermostat is stuck open it just gradually get warmer? I just want to make sure before replacing the thermostat that it is not just a bad ECT sensor.
Yes, a very strong indicator that your thermostat is bad is that the top hose will not suddenly go from cold to red hot as the thermostat opens and floods the pipe with hot coolant. If it is stuck open then it will never get as hot as it should, only warm, as the 'cycle' is constantly open so it's always flowing through the radiator and being cooled, in these cases you usually also can't get decent hot air inside the cabin as the coolant is never getting as hot as it should. On many cars a new thermostat is $15-30 and so this is often the best place to start if you suspect it's a likely cause. Other cars they can be very expensive though!! If it's cheap for your car, it's a safe bet if only to rule it out. Hope that helps :-)
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Great video, perfectly explained 👍🏻👍🏻
Very well explained my good man👍🏽thank u
Thank you!!
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Awesome explanation! Thank you very much 👍
Glad we could help :-)
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If the thermostat stays closed could it boil over the reservoir tank?
Yes, but it's designed to fail open.
And if I'm not mistaken if the thermostat is stuck open your temp gauge will show cooler than normal and your heater will not blow hot as usual and be maybe lukewarm.
Yes, absolutely. If your thermostat is stuck open then the coolant is not held in the engine and will just keep circulating through the radiator, so it will not be able to get up to a proper operating temperature. So when you call for heat inside the cabin there will be no heat (or very little) to give as the coolant is not up to temperature. So if you get a combinaition of no warmth inside the cabin coupled with the temperature gauge always sitting low, then this is a good indicator of a faulty thermostat (open). Hope that helps! :-)
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@@YouWrench Yup. it was my thermostat..blowing hot now like new.
@@YouWrench mine is still running cold w a new thermostat. I can take off radiator cap after the car has been running for 3-4 hours
Top radiator hose very hot car overheating still. Bad water pump?
Very good explanation without a doubt. Can you please tell is there any harm in using a thermostat that opens up at a lower temperature than the factory, during very hot summer months with ac on?
Thank you! Hard to say, provided it's keeping the engine cool at it's required temperature then in theory it could be ok. That said, if it's doing that due to a possible thermostat fault then don't risk it, just replace it. It's easy and the thermostat is very cheap too (check out the Amazon link in the descriptive text of the video for the best deal!)
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Having a thermostat stuck open will not cause immediate damage, but can cause issues over time if left unfixed. The main thing you will likely see is in the winter the cars heat will not work well (will take forever to heat up, and then will likely not blow as hot when you are driving fast on interstates and highways). That can be annoying but the damage can come overtime since the engine is not getting to the proper operating temperature it was designed to operate at. The car will adjust the air to fuel ratio putting more fuel in (running rich when engine is cold) and can cause carbon build up and more wear on injectors. The engine oil will also not be getting up to the proper temperature and will not lubericate as well as it would at operating temperature. So to sum up, if you live in a warm climate and it is stuck open you will likely not have any issues other than a potential check engine light. If you are in a cold climate your heat will not work as it should, and you will put additional wear on the engine over time.
thank you. So what happens if the car only overheats in heavy traffic? Otherwise everything runs ok when there is no heavy traffic
Would the thermostat being broke have anything to do with the fan running super loud constantly after about 3-4 seconds of turning the car on?
nice, my car seems to warm up quite slowly, gonna check it tomorrow.
Good luck with your testing :-)
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Another way is to touch the bottom radiator hose. If the top hose is hot and the bottom hose is cold, then the thermostat is stuck in the closed position. If the bottom hose is hot once the engine has reached operating temperature, then the thermostat is operating correctly. If the top and bottom hoses are heating up at the same pace, then the thermostat is stuck in the open position.
Thank you for your video! It is very helpful!
Glad it was helpful! 👍
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As a young lady, I do make every attempt to educate myself about my car and other things. This was a very easy video to understand! If it's this easy to determine condition of a thermostat, then why do the Jag dealership charge a lot to check them out and exaggerate the amount of time the diagnostic takes? I'm just curious!
I will be taking it in soon because, apparently, there's a thermostat issue. Blah. I just replaced the water pump last year, June 2022!
Vehicle specs:
2017 xe 25t
39,000 gas
2.0 base
Regularly maintenanced for the last 5 yrs at the dealership!
Miffed right now about this thermostat concern. 🙄
Miffed last year about replacement of water pump!
Suggestions and comments are welcomed!
Thank you, sir!
So they can make money !!😅
Your dealer would just connect it to their scanner first, they wouldn't do a manual test like this... 😂
As someone else has posted.. get a Bluetooth OBD2 (OBDII) scanner from your local automotive store and torque pro app and connect to your mobile phone... cost you less than $50
(Since you want to learn)... potentially save you lots of money.
Since you already suspect thermostat problems.. NEVER go to a dealership who charge an arm and a leg - go to a local mechanic....(caveat !!) BUT who knows your type of car.
I have a Vivaro Diesel and just had the water pump changed, now I cant get rid of air from the system by bleeding it as it keeps pressurising. I suspect a cylinder head problem solely because the water pump has been changed but there is no white smoke, no sign of moisture on the oil filler cap and no bubbles in the bottle. Could it be just the thermostat? The van heater only blows cold and occasionally warm but not hot. My local garage suspect a cylinder head gasket but won't take the work on because they say removing the injectors is too difficult. They suggest scrapping it but the van is in great condition otherwise. Is it common for air to be ingested into the cooling system even though there is no obvious sign of a leak?
Awesome explanation
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what a really extremely great video... thank a lot👍
Glad it was helpful for you!
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very informative and simple ... thanks
Thank you :-)
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You're awesome!! I was wondering if I should replace my thermostat. I subscribed to your Channel. You're the bomb💣
Thank you, much appreciated!
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There is another issue that happens every 10 years on my truck. Air builds up in the top hose and stops the heater from working in the cab. Only cold air comes out of the vents. Each time this happens I loosen the over fill tank cap and burp the top radiator hose while the engine is running. By decompressing the top hose over and over you will see the over fill tank coolant level move up and down. Once the air is removed, heat in the cab will be restored. Just like hot water boilers in a home, air in a system causes no coolant to reach the heater core fins.
If this was happening, would it also cause the heat gauge to start to rise and get hotter? Just trying to key doen exactly what the action and reactions are and this made me ponder that haha
Hi how much should it cost to replace the thermostat? Parts and labour on a audi a3 1.6 tdi?