If you are having a hard time with this fix, watch our playlist on this issue! We have four detailed videos that will help you get this done. Linked here: ruclips.net/p/PLnPXcXYmgiuvbA7f_Zot4ScG1DJ7QJgO8&si=OqNTg7gH2p1DANMl
Bless you!! Our '17 Sierra JUST did this, and I told my husband "two seconds" while I RUclips it. I KNEW somebody could give me a fix, and here you are! Thank you so much! It blew our minds. We're not young folk, but we've never seen this before. Lol
Thank you brother. I ordered the thermostat at work today from Napa. Just finished installing it and now to start it and see my fix. Again thank you and have a wonderful week
Man you guys are awesome. Just happened today. Got er done in about 45 mins. It’s a work truck so I can’t be off the road for too long. Many thanks for making it an easy fix.
2016 Siverado - I want to thank you very much. Sensor, stat and anti freeze $81.00 at O'Reillys. The first thing I struggled with was the clip for the airbox. I didn't want to break it, couldn't figure it out and found one of you other videos that helped me. Everything rolled pretty good from there. As I was taking the sensor out it fell behind the water pump. Tried to fish it out and it went in deeper.....now it's staying in there. Everything went juts like you said, I did not have a 19 MM deep socket, but a spark plug socket worked....? Anyway, you guys saved me at least $150.00 so anytime your coming to Paso Robles, CA for wine tasting please look me up and we'll drink some wine! Thumbs up and I subscribed, I will tell everyone. Need to change my passenger door lock actuator next......
Excellent video which helped me address the same issue on my ’15 Silverado 4.3L V6. Be very careful tightening down the bolts on the thermostat. Torque specifications for the bolts are, 89 in. lbs. for the 4.3L V6, 5.3L and 6.2L V8* 132 in. lbs. for the 6.0 V8* *According to Chilton's manual I did not have an inch-torque ratchet so I made my best guess and tried not to over tighten the bolts. After replacing the part, I test drove the truck. When I got back, I checked the thermostat and there was a very small bit of seepage at the mating surfaces. As I was tightening the bolts, one of them broke. With some difficulty I was able to get it out but the threads got messed up in the process. Not having a tap-n-die set, I had to use a slightly smaller bolt secured with a nut. This worked well.
Did you disconnect the battery? Double check your work. Make sure everything is connected correctly. Are you using the correct parts? Make sure you are using the sensor and thermostat for your truck.
Using AC Delco parts for my exact uear. I forgot to mention I replaced the water pump, the thermostat and housing as it was all one piece. It ran fine after all the above and then today 6 months later the nightmare re-occured. Yes battery was disconnected and GM premixed coolent used.
Also of note. I found when changing oil a week ago my Coolent was low in reservoir, I have smelled coolent a few odd times. No visible leaks upon inspection. So unless you have a better suggestion, next is compression testing, then onto pulling the radiator.
Totally the thermostat. Coolent is clean. After resetting computer the gauge wants to work again. But cold or hot squeezing the low and high hoses to radiator moves the cpplent level in the reservoir
If anyone is still following. The thermostat plastic disintegrated near the reservoir line. Explains the leaking coolent. Replaced with Napa thermostat. One month in town driving all good. Then moment of truth. Towed a trailer. Camping. On way up i-70 from Denver the engine temps go way up. And kept bouncing between 207 and 250. Pretty amazing right. Well then I end up at a parts store. They have the premium 194 degree thermostat. Op't for this lower temp one. Pulled trailer home fine. Temperature stayed at 205ish and tranmission stayed at 194. With exception of vual pass and the Eisenhower tunnel. Conclusion: 194 degree thermostat is the only answer. Parts stores are selling us garbage. Keep a spare handy becuase these things are failing like one timeba year. R8ght after warranty expires.
Replaced both my sensor and thermostat just now. Burped the system and so far so good. Ideally it’s best to replace the thermostat if you have a bad sensor, cause the thermostat and sensor are on the same line!
EXCELLENT! Wife’s 16 Suburban just started doing this today. Ordered the thermostat and temp sensor from Advance Auto.. Even a tiny bit of mechanical inclination can get you through this and save some money at a shop.. Update a day later: Hell yeah! Temp 210 and holding!
My 2015 Silverado started this issue last night. I'm heading to the parts store to get these parts. Thank you for the great tutorial. I just subscribed to your channel.
Great help with this one. I was able to be hands on with it. I was a but unsure which way the clips pushed on the vent hookup so try pushing the middle and then pull if you're doing it. I also should have put a catch under the truck, the container was not enough for me. Other than that, everything was spot on! $70 for parts and quote from dealer would have been $800. Thanks.
I just had this happen about a week after installing Mishimoto radiator, Mishimoto Transmission radiator, Sure-cool Transmission bypass and Mishimoto radiator hose kit. It hasn't happened in a week since the first time but I will look at replacing 2 parts needed with OEM components and with battery unplugged.
Thanks for the informative video! I had the "demonic possesed fan" problem in a 2017. Scan tool showed the coolant temp rarely getting over 140F. I replaced both the TStat and sensor at the same time, about a 15 minute job. After, I realized my truck had been running cooler and cooler for a while and my mileage was dropping! 😉 I always had good heat, so I attributed it to winter weather and mostly short trips. I'm pretty sure the real problem was the TStat, but the sensor was cheap and easy enough to replace while I was there. Now the temp gauge reaches straight up and down and the fuel mileage has improved.
This is awesome. Thank you very much for making this video. My husband is out of town and this just happened to me last night. So strange there wasn't any warning, pulled in the driveway and heard the loud fan for the first time.
My wife pulled up just today after traveling about an hour and 40 minutes and I could hear the fan just running maximum speed.. Like Great! What’s this gonna take you fix..? How much? Thank god this is a $100 fix and half hour of my time..
Along with the temp sensor, can you just replace the thermostat or do you need to replace the whole housing as well? I see you replaced the housing in the video. Very helpful video. :)
When you purchase a new thermostat it comes with the housing. So, there's no point in just replace the thermostat and not the housing. If you have the new part, you might as well use it. Thanks for watching!
I’m not sure if I have the same issue. My temperature increases and I get a warning that the AC will be powered off. If I turn off the AC, the temperature goes back down. I changed the sensor and will be changing the thermostat to see what happens. I get no codes or other lights. Doesn’t happen every time I drive either. I have a 2017 Silverado 1500, 5.3L.
I'm having this same issue right now. I'm getting to replace the thermostat. Now I've already replaced the temp sensor a couple weeks ago do I have to replace it again? Or can I just unplug it then plug it back in?
I’ve been having my 2017 sierra for 2 years. Been dealing with this issue for a year. Been putting it off thinking it was going to be a hassle. But I’ve already had the compressor and radiator replaced and now I’m sick of undoing my negative side of the battery every time the sensor goes out. This truck has been giving me nothing but problems. I wonder what’s next? I will say this video is great. Follow it step by step. Always my biggest problem is CLIPS! Idk if I’m the only one that always has problems with clips, but they’re a pain in the butt!
I just had this problem pop up. J work at a major automotive parts store, im also an 87 uti grad. My question is whats the marrying of the sending unit and the thermostat. I noticed when looking up sending units they none show the sending unit parameters however the thermostat does. Maybe im over thinking this but seems temp parameters of sending unit would be helpful..
To be honest, I'm not sure the answer to that question. All I know is that if your place one or the other, the issue will continue. By replacing both and resetting the computer (disconnecting the battery), the issue will be solved.
I have a 2019 Chevy Silverado with 65m miles 4.3 v6 WT. I did everything you and others have suggested. Same issue after each time. Finally broke down a went to Chevy dealer. $1200.00 later after they replaced the same items and the WIRES from sensor. Which they didn’t charge me for. Could it be that this is the real issue on these trucks?
Does this issue effect the AC temp inside the vehicle? My GMC Sierra is having the issues described in the video, but now I'm noticing my AC is not as cold as it should be? Thanks in advance, all responses appreciated
I need to repair my truck with this same issue. My question is which degree thermostat would I need? I see there is one for 207F and another one for 194F. I have a 2014 5.3. Thanks!
We did everything exactly but the fan is still running after replacing both parts. What do we need to do next? The problem started when we cut the heat on.
Hi,i have 59 chevy with 2004 Silverado 4.8 swap, cooling fan stopped cutting in, temperature sensor works on obd scanner,fan does work on both speeds when hot wired and fan doesn't come on at all ,it boiled up sitting in traffic yesterday 🤦♂️any idea?thanks
Yes it is necessary to fill up the coolant. If you don't you'll be running with less coolant, and you can damage your truck. We did not fill it all the way to the top, we filled it to the filling line. Do not overfill and do not keep it underfilled. Keep it at the fill line, and refer to your owner's manual for instructions.
There are other issues that cause this apparently because i followed this to the T. My issues are identical. All OEM parts. Water pump thermostat and temp sensor. Got it all neatly back together, reconnected the battery..issue came back about 20 minutes of driving later. Extremely disappointing. Ive heard A/C relay, changed that, issue came back about a week later. Issue throws no codes. 4.3 ecotec. OEM everything. Any ideas?
I can't understand how the thermostat could be related to these issues. Or more precisely, how the combination of the TStat and CTS creates the issue. Forgive me, I don't mean to question your knowledge, I am just genuinely unsure of how the two could be related. I can see either one causing the fans to run or the AC to not operate properly. Stuck closed thermostat= high temp = running fans and maybe some issue with getting cool air or high temp forces the AC off as a protective measure. Bad CTS failsafe to a running fan. Only the temp sensor could explain the temp indicator never moving from 160. The sensor is upstream of the TStat right? Any additional explanation would be appreciated thank you :)
A lot of people can't understand this issue. All I can say is that if you don't replace both, the issue will return. These parts most likely fail together. If you don't replace both right away, you end up having to eventually.
@TheBrothersWorkshop Thank you for the reply. This is very fascinating. I will try to relay back to you what I find. So far, all I have noticed is the following: When I noticed the issue, my first step was to remove the sensor and hook up to a multimeter. I was expecting an open or a short. I found that the sensor was reading approximately 2.5Kohms. I also found that the resistance varied as expected with varying temperatures. I assumed this was not a problem, but I wasn't certain of the specs of this sensor, so when I saw your video and the price of the sensor, I just went for it. When I bench checked the new sensor, it appeared to operate in the same range. Room temp somewhere around 2.5k and fluctuating with temp appropriately. Now, I decided to replace the CTS with the new one anyway, just in case I was missing something. The new sensor did not clear the symptoms on its own. Resetting ECM by disconnecting the battery and reconnecting it DID stop the dash indicator and aux fan symptoms. My A/C issue turned out to be one of the MANY leaking condensers, unfortunately. So that said, I did not replace the thermostat. About 4 days later, the problem returned. This time, I decided to just try the "ecm reset" ONLY. This, again, got rid of the symptoms. It has been a number of days since then and the issue has not yet returned. I want to wait for it to return again just for repeatability and maybe see if I can determine some other contributing factors. After that, I will replace the thermostat. Last, after some time passes, that leads me to believe the problem is actually solved, I would like to reinstall the old sensor just out of sheer curiosity(and because it is so easy) to find out if the problem returns. I will let you know how it goes 😆 Isolating the efforts to solve the issue, here is my summary so far: SENSOR REPLACE: FAULT REMAINS VEHICLE ON/OFF 3-4 TIMES: FAULT REMAINS BATERY DISCONNECTED/RECONNECTED: FAULT CLEARED 2-3 DAYS PASS: FAULT RETURNS BATERY DISCONNECTED/RECONNECTED: FAULT CLEARED 4-5 DAYS PASS: ......WAITING FOR FAULT TO RETURN Unfortunately, i was not keeping track of vehicle use(Start/stop, miles or time driven, etc.) during these waiting periods. I can say the vehicle was not driven every day and never for more than ~35 min.
All you need to do now is change the thermostat. We made three other videos on this topic but everyone overlooks them. That is why we made this new video. Gotta replace the sensor and thermostat at once.
I replaced the thermostat, and the sensor disconnected the battery but the fans continued to run. Other than the thermostat and sensor, have you run into any other issues that can cause this?
@@TheBrothersWorkshop I verified the parts are compatible before installing and I went back through the install and nothing seem out of placed or incorrect. I do appreciate you replying to my message
@@dvnwlkrwhat was the final fix since the sensor and thermostat didn’t do it for u. Im Curious because i have a coworker with same issue. He replaced both parts and they still staying on
@@TheBrothersWorkshopthank you! I did end up disconnecting both, and thanks to your awesome video and clear instructions, I completely resolved this issue by replacing both the thermostat and the temperature sensor 🙌🏼 and I am not mechanically inclined at all. Thank you again! I’m pretty proud of myself 😂😁
Is my truck okay to drive while I wait for the parts on Amazon? Would resetting the battery be a good option as well during the time I am waiting for the part?
It should be fine. I drove my truck while out of town on a road trip, until I was home and able to fix it. You can sometimes turn the truck on and off twice and the fan will stop.
@@TheBrothersWorkshop My 2016 Sierra did this last night. I was able to shut the motor off...then turn the key to ign but not to start. When the computor 'checked' the engine the fan shut down. I will be doing this fix today! Thanks!
So... we replaced the temp sensor a month ago and still had the fan continue to turn after turning off the truck. It did not do it all the time. But it would run the battery down regardless. Then we changed the thermostat yesterday. The temp level stabilized and the fan does not run when turning off the engine, but the battery still drains over several hours. The battery does charge when the engine is running and we put a charger on it, then it will start. Why would this continue to happen? Did it not reset after the change (disconnected the battery during change).
@@TheBrothersWorkshop Wanted to follow up... We did have a dead cell in the battery and replace the battery. Everything is working as expected, temp gauge right, no fan running, etc. Thanks again for your help!
So I just replaced the sensor and the thermostat, and I turn the truck back on and my engine fan Is still on high and doesn't turn off and went to clear the codes and it says "error failed to clear codes, you think it may be an electrical issue with the sensor harness?
I brought it back in for a diagnostic, and now they said that the A/C pressure sensor and the wire harness that connects to it, is bad so I went under truck and seen the wire harness to the A/C pressure sensor, the wire is tore up, so I'm about to replace that and I will double check the work I did.
@TheBrothersWorkshop I fixxed it, it was the A/C pressure sensor and the the A/C pressure sensor wire harness, went to chevy bought the parts and installed it and spliced the wires, and works great now!
Auto shop tries to charge me $1300-$1400, and have the truck all day, im like nahhh, my dude, paid $178 at chevy for both parts and did it myself, in like a couple hours
You need to replace the temperature sensor and the thermostat. Disconnect the battery and everything will work correctly. Follow the steps in the video and the issue will be fixed.
Mine was doing this and replaced the Temp Sensor and fixed it (prior to watching this video). It came back a month later and I replaced both and my AC still won't work. I unhooked battery for a half hour after even.
The AC in these trucks are notoriously bad. You most likely have an unrelated issue. Your AC issue most likely stems from the condenser or the vacuum lines. It depends on the year of the truck, but they all fail. It's an expensive issue that is once again known by GM, but they won't do anything about it.
The problem with my 2015 Sierra 1500 SLT doesn't seem to be exactly what I see on these videos. First, when the fans start running full blast, I don't see a Check Engine light. Second, if I let the fans run for about five minutes after shutting off the engine, they will finally go off, but will start up at full blast again when I restart. Third, if I reset the ECM (removing the negative connection on the battery), the problem goes away, and may not occur again for maybe a week or so. This behavior makes me unsure that the problem would be the temperature sensor, but the only alternative I can think of would be a bad ECM. Are there any thoughts about this? Thanks!
Hey man! The problem you are describing is exactly what happens here. I tried my best To articulate that in the video. The four trucks we worked on did not have a check engine light. Disconnecting the battery is a very short term fix because the issue comes back. After turning the truck on and off the fan stays on. It also runs extremely high. I realize that I forgot to mention there is no check engine light and the fan runs high. However, this is that problem! You MUST replace both the thermostat and temperature sensor to fix the problem! I've done this fix on four trucks and I know this works for the issue you described.
@@TheBrothersWorkshop Thank you! I'm sorry if I didn't catch all the points of your video, so it's not your fault. On the next good day I'll replace both items and see how it goes. But you have definitely provided some encouragement for me. Thanks again!
Hey i did everything right in the video.. disconnected battery and all .. now everything is back together but my fan didnt turn on do i gotta wait or is smething wrong
Great video thanks! Just one question, has anyone ran into the issue that the outside temperature display(on the radio) is stuck on a certain temp after doing this job? Mine is stuck on 32 degrees with a battery reset
Refer to your owner's manual for that. I don't know what type of engine you have. There are three of them, so I can't give you an answer for information that I don't have.
It's such a bummer these trucks have issues like this. I'm glad people make good videos like this. I was able to fix mine from their last videos about this stupid issue.
Thanks man. We had a three part video series, but people never watched all three, just the first one. Hopefully one video explaining everything will help people more.
Tried disconnecting the battery and reconnecting it. However, this video is about the Chevy Silverados in the trucks with the specific motor 5.3 and 4.3, not a Chevy Cruze.
Have 2014 Silverado 5.3 L. During rain or snow while driving & after…I always get a huge steam session coming from front of truck. Does anyone else visually see this steam coming from front? I’m not losing rad fluid so I know it’s not a leak.
No, I'm sorry but that will not work. This is an issue because the parts failed. I just read your other comment, if you're still having this issue after replacing the parts you may have a different issue. First and foremost make sure that you have disconnected the battery and reconnect it.
Only difference with mine is the temperature gauge is not stuck at 160. Its at 210..whats interesting about my issue is if i turn ac off the fans stop running..in 2 or 3 minutes. Now when i turn ac on the fans start almost immediately.. 🤔
@@TheBrothersWorkshop temp comes up to 210 and stays there. But the fans never kick on. Replaced the temp sensor again and fans still not coming on. The fans do work. Maybe just not getting hot enough for the fans to come on? Sometimes there is steam coming from radiator not all the time though.
did this and everything sounded good. took it to get gas and then when i drove back home, it started shifting weird then downshifting hard. anyone else have this issue? i don’t know how shifting has anything to do with the replacement
Electrocuted by 12volt dc? 😂😂 i must b one lucky sob! Been automotive wrenching professionally & shadetree for over 50 yrs. Made lots of sparks WITHOUT electrocution.
'17 Sierra 1500. Fans were running after engine was shut off. Replaced the sensor and the thermostat. Everything was back to normal. 2 weeks later and the fans are running again when shut off. Had a read done and it is saying I need to replace the relay. I have searched and searched and cannot find where a cooling fan relay is. Could it be called something else? @thebrothersworkshop
Did you disconnect and reconnect the battery? This is the typical culprit. If you are throwing codes, you may have a different issue all together. Our issue happened without triggering any codes.
Disconnecting the battery does nothing but reset the computer, but sooner or later the problem will come back even after replacing the parts I've been dealing with this issue for over a year now, I've replace multiple sensors and thermostats (using oem and other brands) and problem comes back The easy "fix" Disconnecting the battery for 5 min. And fans will go back to normal
yeah, I have disconnected the battery and it does reset it. Finally was working for a while and now back to the same issue. Still reading as a fan relay issue but cannot find the location anywhere for it. Is it possible for a high pressure switch or water pump to be throwing off the temperature sensor?@@TheBrothersWorkshop
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If you are having a hard time with this fix, watch our playlist on this issue! We have four detailed videos that will help you get this done. Linked here: ruclips.net/p/PLnPXcXYmgiuvbA7f_Zot4ScG1DJ7QJgO8&si=OqNTg7gH2p1DANMl
What size socket is used to fix the sensor?
Bless you!! Our '17 Sierra JUST did this, and I told my husband "two seconds" while I RUclips it. I KNEW somebody could give me a fix, and here you are!
Thank you so much! It blew our minds. We're not young folk, but we've never seen this before. Lol
You’re very welcome! We’re glad you found our video useful, and that we could be of help!
DISCONNECT the battery after 10 minutes cleared the Engine Warning and fixed the temp gauge issue !!!! I was going crazy after the parts replacement.
Yes, we said disconnect the battery. That is very important to do!
Thank you brother. I ordered the thermostat at work today from Napa. Just finished installing it and now to start it and see my fix. Again thank you and have a wonderful week
Awesome bro! Glad we could help. Don't forget to disconnect the battery!! 🔋
Man you guys are awesome. Just happened today. Got er done in about 45 mins. It’s a work truck so I can’t be off the road for too long. Many thanks for making it an easy fix.
I'm very glad to have been able to help you out!
2016 Siverado - I want to thank you very much. Sensor, stat and anti freeze $81.00 at O'Reillys. The first thing I struggled with was the clip for the airbox. I didn't want to break it, couldn't figure it out and found one of you other videos that helped me. Everything rolled pretty good from there. As I was taking the sensor out it fell behind the water pump. Tried to fish it out and it went in deeper.....now it's staying in there. Everything went juts like you said, I did not have a 19 MM deep socket, but a spark plug socket worked....? Anyway, you guys saved me at least $150.00 so anytime your coming to Paso Robles, CA for wine tasting please look me up and we'll drink some wine! Thumbs up and I subscribed, I will tell everyone. Need to change my passenger door lock actuator next......
Excellent video which helped me address the same issue on my ’15 Silverado 4.3L V6.
Be very careful tightening down the bolts on the thermostat.
Torque specifications for the bolts are,
89 in. lbs. for the 4.3L V6, 5.3L and 6.2L V8*
132 in. lbs. for the 6.0 V8*
*According to Chilton's manual
I did not have an inch-torque ratchet so I made my best guess and tried not to over tighten the bolts.
After replacing the part, I test drove the truck. When I got back, I checked the thermostat and there was a very small bit of seepage at the mating surfaces.
As I was tightening the bolts, one of them broke. With some difficulty I was able to get it out but the threads got messed up in the process. Not having a tap-n-die set, I had to use a slightly smaller bolt secured with a nut. This worked well.
6 months and problem came back today. Ive now replace the sensor 3 times and the thermostat 1 time in combination with the sensor. Thanks a lot GM..
Did you disconnect the battery? Double check your work. Make sure everything is connected correctly. Are you using the correct parts? Make sure you are using the sensor and thermostat for your truck.
Using AC Delco parts for my exact uear. I forgot to mention I replaced the water pump, the thermostat and housing as it was all one piece. It ran fine after all the above and then today 6 months later the nightmare re-occured. Yes battery was disconnected and GM premixed coolent used.
Also of note. I found when changing oil a week ago my Coolent was low in reservoir, I have smelled coolent a few odd times. No visible leaks upon inspection.
So unless you have a better suggestion, next is compression testing, then onto pulling the radiator.
Totally the thermostat. Coolent is clean. After resetting computer the gauge wants to work again. But cold or hot squeezing the low and high hoses to radiator moves the cpplent level in the reservoir
If anyone is still following. The thermostat plastic disintegrated near the reservoir line. Explains the leaking coolent. Replaced with Napa thermostat. One month in town driving all good. Then moment of truth. Towed a trailer. Camping. On way up i-70 from Denver the engine temps go way up. And kept bouncing between 207 and 250. Pretty amazing right.
Well then I end up at a parts store. They have the premium 194 degree thermostat. Op't for this lower temp one. Pulled trailer home fine. Temperature stayed at 205ish and tranmission stayed at 194. With exception of vual pass and the Eisenhower tunnel.
Conclusion:
194 degree thermostat is the only answer. Parts stores are selling us garbage. Keep a spare handy becuase these things are failing like one timeba year. R8ght after warranty expires.
Replaced both my sensor and thermostat just now. Burped the system and so far so good. Ideally it’s best to replace the thermostat if you have a bad sensor, cause the thermostat and sensor are on the same line!
Followed your tutorial and fixed my issue smoothly. Thanks so much!
Glad to hear it! 🙌
EXCELLENT! Wife’s 16 Suburban just started doing this today. Ordered the thermostat and temp sensor from Advance Auto.. Even a tiny bit of mechanical inclination can get you through this and save some money at a shop..
Update a day later: Hell yeah! Temp 210 and holding!
So glad we could help you out! Thanks for watching and letting us know that this easy fix worked for you as well. 🙌
Your directions were perfect. I replaced both as you recommended. My 2015 Tahoe runs great! Thank you!
Glad we could help you out!
My 2015 Silverado started this issue last night. I'm heading to the parts store to get these parts. Thank you for the great tutorial. I just subscribed to your channel.
Thanks man! Good luck on your project, it shouldn't take you long at all to fix.
Same! Just happened to me tonight, and well here i am lol
Me too. 2015 as well. Like they designed it to do it lol
lol my 2015 Silverado did this tonight out of nowhere , 3 weeks apart from you mate
@@JoeBruno my truck is running great now. It was a simple fix. I promise you...
Great help with this one. I was able to be hands on with it. I was a but unsure which way the clips pushed on the vent hookup so try pushing the middle and then pull if you're doing it. I also should have put a catch under the truck, the container was not enough for me. Other than that, everything was spot on! $70 for parts and quote from dealer would have been $800. Thanks.
Glad it helped! Thanks for watching and thanks for taking the time to leave a comment. We really appreciate that!
I just had this happen about a week after installing Mishimoto radiator, Mishimoto Transmission radiator, Sure-cool Transmission bypass and Mishimoto radiator hose kit. It hasn't happened in a week since the first time but I will look at replacing 2 parts needed with OEM components and with battery unplugged.
Thanks brother. Just finished the install of the thermostat and the sensor about the crank it up. Two thumbs up and I’m subscribing.
Thanks for subscribing bro! Glad we could help you out. This is a really easy "DIY" fix.
I changed my thermostat , temp sensor and still does it , when I disconnect the battery it’s good for about 2 weeks then does it again any help !
Thanks for the informative video! I had the "demonic possesed fan" problem in a 2017. Scan tool showed the coolant temp rarely getting over 140F. I replaced both the TStat and sensor at the same time, about a 15 minute job. After, I realized my truck had been running cooler and cooler for a while and my mileage was dropping! 😉 I always had good heat, so I attributed it to winter weather and mostly short trips. I'm pretty sure the real problem was the TStat, but the sensor was cheap and easy enough to replace while I was there. Now the temp gauge reaches straight up and down and the fuel mileage has improved.
I'm glad to hear that we helped you fix your truck. 🙌 Thanks for watching! 😁
This is awesome. Thank you very much for making this video.
My husband is out of town and this just happened to me last night.
So strange there wasn't any warning, pulled in the driveway and heard the loud fan for the first time.
That's exactly what happened to us the first time.
My wife pulled up just today after traveling about an hour and 40 minutes and I could hear the fan just running maximum speed.. Like Great! What’s this gonna take you fix..? How much? Thank god this is a $100 fix and half hour of my time..
Thanks man! I appreciate your channel. I was able to fix my truck today.
Grateful for the education.
I'm glad to hear that. We make a lot of videos about these trucks. Check them out and if you wanna see anything we haven't done, let us know!
Followed all the steps and problems solved. Thank you for this informative video. Y’all rock!
I'm glad we could help!
Very cool. You took your time. Always give us the socket sizes.
Glad we could help!
Along with the temp sensor, can you just replace the thermostat or do you need to replace the whole housing as well? I see you replaced the housing in the video.
Very helpful video. :)
When you purchase a new thermostat it comes with the housing. So, there's no point in just replace the thermostat and not the housing. If you have the new part, you might as well use it. Thanks for watching!
I’m not sure if I have the same issue. My temperature increases and I get a warning that the AC will be powered off. If I turn off the AC, the temperature goes back down. I changed the sensor and will be changing the thermostat to see what happens. I get no codes or other lights. Doesn’t happen every time I drive either. I have a 2017 Silverado 1500, 5.3L.
Great Video, Fixed my problem in 45 minutes. Thank you.
Glad to hear it!! 🙌
I'm having this same issue right now. I'm getting to replace the thermostat. Now I've already replaced the temp sensor a couple weeks ago do I have to replace it again? Or can I just unplug it then plug it back in?
If you have already replaced the sensor, just disconnect the battery and replace the thermostat. Once you do that everything should work as it should.
I’ve been having my 2017 sierra for 2 years. Been dealing with this issue for a year. Been putting it off thinking it was going to be a hassle.
But I’ve already had the compressor and radiator replaced and now I’m sick of undoing my negative side of the battery every time the sensor goes out. This truck has been giving me nothing but problems. I wonder what’s next?
I will say this video is great. Follow it step by step.
Always my biggest problem is CLIPS! Idk if I’m the only one that always has problems with clips, but they’re a pain in the butt!
I just had this problem pop up. J work at a major automotive parts store, im also an 87 uti grad. My question is whats the marrying of the sending unit and the thermostat. I noticed when looking up sending units they none show the sending unit parameters however the thermostat does. Maybe im over thinking this but seems temp parameters of sending unit would be helpful..
To be honest, I'm not sure the answer to that question. All I know is that if your place one or the other, the issue will continue. By replacing both and resetting the computer (disconnecting the battery), the issue will be solved.
I have a 2019 Chevy Silverado with 65m miles 4.3 v6 WT. I did everything you and others have suggested. Same issue after each time. Finally broke down a went to Chevy dealer. $1200.00 later after they replaced the same items and the WIRES from sensor. Which they didn’t charge me for. Could it be that this is the real issue on these trucks?
Is there a second engine temperature sensor other than the coolant sensor that is beside the thermostat? Any ideas on where it would be located?
Does this issue effect the AC temp inside the vehicle? My GMC Sierra is having the issues described in the video, but now I'm noticing my AC is not as cold as it should be? Thanks in advance, all responses appreciated
This is usually happen to us during winter, so we've never noticed an AC issue. However, people we've talked to have had AC issues.
I think this is because the radiator is keeping the engine too cold to be efficient with AC. You need to generate heat to have AC
mine just did this today!! thank you part on order!
Awesome! It's an easy fix. You'll have it done in no time at all!!
Great video! Will replace mine today and let you know!
I'm glad we could help!
I need to repair my truck with this same issue. My question is which degree thermostat would I need? I see there is one for 207F and another one for 194F. I have a 2014 5.3. Thanks!
Which one?
OEM is 207°F.
We did everything exactly but the fan is still running after replacing both parts. What do we need to do next? The problem started when we cut the heat on.
Hi,i have 59 chevy with 2004 Silverado 4.8 swap, cooling fan stopped cutting in, temperature sensor works on obd scanner,fan does work on both speeds when hot wired and fan doesn't come on at all ,it boiled up sitting in traffic yesterday 🤦♂️any idea?thanks
Sorry I don't know where to begin on that one.
That’s a perfect video, It helped me a lot! Keep up with the type of content men!
Thank you 👊🏽
Glad it helped!
I've had this problem for a while if I do this it will make my AC blow cold as well?
It's a possibility but the AC is known to go bad in these trucks. You may have a bad AC system.
is there any a/c issues with the gmc or silverado? mine wont blow cold air
Yes, the ac units are notoriously bad.
Was it necessary to top off the coolant? I know there's a full line that's a bit lower. I notice you filling it all the way to the top.
Yes it is necessary to fill up the coolant. If you don't you'll be running with less coolant, and you can damage your truck. We did not fill it all the way to the top, we filled it to the filling line. Do not overfill and do not keep it underfilled. Keep it at the fill line, and refer to your owner's manual for instructions.
I just bought a sensor a week ago. Already installed. So if im switching out the thermostat should i get another sensor? Thanks
No, you should be fine. The sensor is still new.
The Difference is my truck doesn't do it all the time & Nav temperature goes up to 200 as normal. Could it still be the same issue?
Yes, if the fan stays on, it is still a possibility.
There are other issues that cause this apparently because i followed this to the T. My issues are identical. All OEM parts. Water pump thermostat and temp sensor. Got it all neatly back together, reconnected the battery..issue came back about 20 minutes of driving later. Extremely disappointing. Ive heard A/C relay, changed that, issue came back about a week later. Issue throws no codes. 4.3 ecotec. OEM everything. Any ideas?
If this didn't fix your issue, you don't have this problem described. Sounds like you might have a different issue all together.
What do you try to look for next if you have done this a few times and keeps happening
Clean your connections and check your wires. You may have a faulty connection.
I can't understand how the thermostat could be related to these issues. Or more precisely, how the combination of the TStat and CTS creates the issue.
Forgive me, I don't mean to question your knowledge, I am just genuinely unsure of how the two could be related. I can see either one causing the fans to run or the AC to not operate properly. Stuck closed thermostat= high temp = running fans and maybe some issue with getting cool air or high temp forces the AC off as a protective measure. Bad CTS failsafe to a running fan. Only the temp sensor could explain the temp indicator never moving from 160. The sensor is upstream of the TStat right? Any additional explanation would be appreciated thank you :)
A lot of people can't understand this issue. All I can say is that if you don't replace both, the issue will return. These parts most likely fail together. If you don't replace both right away, you end up having to eventually.
@TheBrothersWorkshop Thank you for the reply. This is very fascinating. I will try to relay back to you what I find. So far, all I have noticed is the following:
When I noticed the issue, my first step was to remove the sensor and hook up to a multimeter. I was expecting an open or a short. I found that the sensor was reading approximately 2.5Kohms. I also found that the resistance varied as expected with varying temperatures. I assumed this was not a problem, but I wasn't certain of the specs of this sensor, so when I saw your video and the price of the sensor, I just went for it. When I bench checked the new sensor, it appeared to operate in the same range. Room temp somewhere around 2.5k and fluctuating with temp appropriately.
Now, I decided to replace the CTS with the new one anyway, just in case I was missing something. The new sensor did not clear the symptoms on its own. Resetting ECM by disconnecting the battery and reconnecting it DID stop the dash indicator and aux fan symptoms. My A/C issue turned out to be one of the MANY leaking condensers, unfortunately.
So that said, I did not replace the thermostat. About 4 days later, the problem returned. This time, I decided to just try the "ecm reset" ONLY. This, again, got rid of the symptoms.
It has been a number of days since then and the issue has not yet returned. I want to wait for it to return again just for repeatability and maybe see if I can determine some other contributing factors. After that, I will replace the thermostat. Last, after some time passes, that leads me to believe the problem is actually solved, I would like to reinstall the old sensor just out of sheer curiosity(and because it is so easy) to find out if the problem returns. I will let you know how it goes 😆
Isolating the efforts to solve the issue, here is my summary so far:
SENSOR REPLACE: FAULT REMAINS
VEHICLE ON/OFF 3-4 TIMES: FAULT REMAINS
BATERY DISCONNECTED/RECONNECTED: FAULT CLEARED
2-3 DAYS PASS: FAULT RETURNS
BATERY DISCONNECTED/RECONNECTED: FAULT CLEARED
4-5 DAYS PASS:
......WAITING FOR FAULT TO RETURN
Unfortunately, i was not keeping track of vehicle use(Start/stop, miles or time driven, etc.) during these waiting periods. I can say the vehicle was not driven every day and never for more than ~35 min.
If I changed sensor 4 months ago and fan still comes on can I just change thermostat or do I have to replace sensor again when I change thermostat
All you need to do now is change the thermostat. We made three other videos on this topic but everyone overlooks them. That is why we made this new video. Gotta replace the sensor and thermostat at once.
I wish I would have seen this video before. What if I replace the parts and then unhook the battery?
Excellent instruction video! Thank you!
I'm glad it helped!
I replaced the thermostat, and the sensor disconnected the battery but the fans continued to run. Other than the thermostat and sensor, have you run into any other issues that can cause this?
No, double check your work. Make sure all of the parts that you used are compatible with your vehicle.
@@TheBrothersWorkshop I verified the parts are compatible before installing and I went back through the install and nothing seem out of placed or incorrect. I do appreciate you replying to my message
@@dvnwlkrwhat was the final fix since the sensor and thermostat didn’t do it for u. Im
Curious because i have a coworker with same issue. He replaced both parts and they still staying on
Sometimes you have to hook up the scanner and clear the codes it should reset it
Replaced both parts and the truck was fine for a few days and now is doing the same thing again .. any ideas what else it could be??
Make sure you disconnected the battery to reset the computer. Also double check your work, did you do everything correctly?
do you have to bleed the system after do all of this?
What's bleeding system?
Are you only disconnecting the negative on the battery?
Disconnect both!
@@TheBrothersWorkshopthank you! I did end up disconnecting both, and thanks to your awesome video and clear instructions, I completely resolved this issue by replacing both the thermostat and the temperature sensor 🙌🏼 and I am not mechanically inclined at all. Thank you again! I’m pretty proud of myself 😂😁
Is my truck okay to drive while I wait for the parts on Amazon? Would resetting the battery be a good option as well during the time I am waiting for the part?
It should be fine. I drove my truck while out of town on a road trip, until I was home and able to fix it. You can sometimes turn the truck on and off twice and the fan will stop.
@@TheBrothersWorkshop My 2016 Sierra did this last night. I was able to shut the motor off...then turn the key to ign but not to start. When the computor 'checked' the engine the fan shut down. I will be doing this fix today! Thanks!
I replaced both parts and still same issue. Disconnected battery for about 30 minutes and problem solved.
My 2014 Silverado just started with the fans staying on but I have heat and A/C but my temp gauge isn’t reading could it be a relay going bad?
So... we replaced the temp sensor a month ago and still had the fan continue to turn after turning off the truck. It did not do it all the time. But it would run the battery down regardless. Then we changed the thermostat yesterday. The temp level stabilized and the fan does not run when turning off the engine, but the battery still drains over several hours. The battery does charge when the engine is running and we put a charger on it, then it will start. Why would this continue to happen? Did it not reset after the change (disconnected the battery during change).
Sounds to me like you have a bad battery or an unrelated electrical issue. You can have your battery tested at napa, advanced auto, or auto zone.
@@TheBrothersWorkshop Wanted to follow up... We did have a dead cell in the battery and replace the battery. Everything is working as expected, temp gauge right, no fan running, etc. Thanks again for your help!
Would this trip the check engine light?
It's possible but usually does not.
So I just replaced the sensor and the thermostat, and I turn the truck back on and my engine fan Is still on high and doesn't turn off and went to clear the codes and it says "error failed to clear codes, you think it may be an electrical issue with the sensor harness?
Double check your work and make sure you did this correctly.
I brought it back in for a diagnostic, and now they said that the A/C pressure sensor and the wire harness that connects to it, is bad so I went under truck and seen the wire harness to the A/C pressure sensor, the wire is tore up, so I'm about to replace that and I will double check the work I did.
@TheBrothersWorkshop I fixxed it, it was the A/C pressure sensor and the the A/C pressure sensor wire harness, went to chevy bought the parts and installed it and spliced the wires, and works great now!
Auto shop tries to charge me $1300-$1400, and have the truck all day, im like nahhh, my dude, paid $178 at chevy for both parts and did it myself, in like a couple hours
I changed the thermostat without disconnecting the battery and fan still runs. If I reset the codes will my problem be solved?
You need to replace the temperature sensor and the thermostat. Disconnect the battery and everything will work correctly. Follow the steps in the video and the issue will be fixed.
Hi. The 1st link works but it’s sold out. Just FYI to make sure you get your $$$ :)
Good look! 🙌🤙🏻
Replaced the thermostat and sensor and now it's working right. The outside temperature on the radio is not right now. How do I fix it?
Nevermind, it fixed itself
Glad to hear that! 🙌
Mine was doing this and replaced the Temp Sensor and fixed it (prior to watching this video). It came back a month later and I replaced both and my AC still won't work. I unhooked battery for a half hour after even.
The AC in these trucks are notoriously bad. You most likely have an unrelated issue. Your AC issue most likely stems from the condenser or the vacuum lines. It depends on the year of the truck, but they all fail. It's an expensive issue that is once again known by GM, but they won't do anything about it.
@@TheBrothersWorkshop appreciate the reply. It's just suspect that it happened at the same time.
Yeah, it's just odd how things happen to these trucks.
Worked perfectly on my 2015 Tahoe. Problem solved.
Glad to hear it.
The problem with my 2015 Sierra 1500 SLT doesn't seem to be exactly what I see on these videos. First, when the fans start running full blast, I don't see a Check Engine light. Second, if I let the fans run for about five minutes after shutting off the engine, they will finally go off, but will start up at full blast again when I restart. Third, if I reset the ECM (removing the negative connection on the battery), the problem goes away, and may not occur again for maybe a week or so. This behavior makes me unsure that the problem would be the temperature sensor, but the only alternative I can think of would be a bad ECM. Are there any thoughts about this? Thanks!
Hey man! The problem you are describing is exactly what happens here. I tried my best To articulate that in the video. The four trucks we worked on did not have a check engine light. Disconnecting the battery is a very short term fix because the issue comes back. After turning the truck on and off the fan stays on. It also runs extremely high. I realize that I forgot to mention there is no check engine light and the fan runs high. However, this is that problem! You MUST replace both the thermostat and temperature sensor to fix the problem! I've done this fix on four trucks and I know this works for the issue you described.
@@TheBrothersWorkshop Thank you! I'm sorry if I didn't catch all the points of your video, so it's not your fault. On the next good day I'll replace both items and see how it goes. But you have definitely provided some encouragement for me. Thanks again!
Hey i did everything right in the video.. disconnected battery and all .. now everything is back together but my fan didnt turn on do i gotta wait or is smething wrong
Double check your work. You must have missed a step or done something wrong.
@TheBrothersWorkshop only thing i did wrong was disconnect sensor first and it leaked everywhere .. cld that have smethin to do with it??
Great video thanks! Just one question, has anyone ran into the issue that the outside temperature display(on the radio) is stuck on a certain temp after doing this job? Mine is stuck on 32 degrees with a battery reset
No, that's a new one that I haven't heard before.
Mine did the same thing today. Stuck on 32. How did you fix it?
I drove it for a while and turned it off . the next day everything was normal. I guess the computer had to clear for a longer period of time
@@carywatson9112let it sit over night. It will read correct temp after 8-12 hrs sitting. Happened to me
Does this affect the power steering
No, it shouldn't have any correlation with the power steering.
@@TheBrothersWorkshop damn, this truck is giving me a lot of headaches haha
Does this also work for a 6.2 V8?
It should.
What do you refill it with after it drains???
Refer to your owner's manual for that. I don't know what type of engine you have. There are three of them, so I can't give you an answer for information that I don't have.
How long can I run the truck with this problem?
Unknown, fix it asap.
Been there done that. Good Visio.
It's such a bummer these trucks have issues like this. I'm glad people make good videos like this. I was able to fix mine from their last videos about this stupid issue.
Thanks man. We had a three part video series, but people never watched all three, just the first one. Hopefully one video explaining everything will help people more.
Omg Thank you❤ problem fixed!
You're welcome!
I need parts number’s brotha working on my truck in the morning
Read the video description. Everything is listed there.
The new thermostat had a new gasket on it?
It should!
I have replaced both of those items and still the fan comes on when I start the car chevy cruze
Tried disconnecting the battery and reconnecting it. However, this video is about the Chevy Silverados in the trucks with the specific motor 5.3 and 4.3, not a Chevy Cruze.
Have 2014 Silverado 5.3 L. During rain or snow while driving & after…I always get a huge steam session coming from front of truck. Does anyone else visually see this steam coming from front? I’m not losing rad fluid so I know it’s not a leak.
I just subscribed because I drive a 16 1500sierra Denali and these videos are helpful.
Thanks for subscribing!! We really appreciate it.
Thank you!!!🙏🏻
No problem!
Is it possible it is not an instant fix and maybe running the truck for a while the computer will fix itself
No, I'm sorry but that will not work. This is an issue because the parts failed. I just read your other comment, if you're still having this issue after replacing the parts you may have a different issue. First and foremost make sure that you have disconnected the battery and reconnect it.
Where is the link for the parts??
They're linked In the video description!
Only difference with mine is the temperature gauge is not stuck at 160. Its at 210..whats interesting about my issue is if i turn ac off the fans stop running..in 2 or 3 minutes. Now when i turn ac on the fans start almost immediately.. 🤔
That is an interesting one. Most likely it's still related to the thermostat or temperature sensor, being that the thermostat is stuck on 210.
Thanks for the content,saved me a tantrum 😂
Haha that's what I like to hear. Saving grown men from tantrums is our job. 😂
What about if your fans don't come on? Just changed the thermostat and temperature sensor
I'm not sure what you're asking? Is your thermostat stuck at 160?
@@TheBrothersWorkshop temp comes up to 210 and stays there. But the fans never kick on. Replaced the temp sensor again and fans still not coming on. The fans do work. Maybe just not getting hot enough for the fans to come on? Sometimes there is steam coming from radiator not all the time though.
Great info!!!
Glad it was helpful!
Good tutorial
Thank you! 🙌
What if I did everything to a T and the fan still runs?
Then you may have a totally different problem. This fixes the problem that we laid out.
Awesome video ...thanks alot
No problem at all!! 🙌
I don’t see where to order the parts
Check the description below.
How many miles do they go out? 50,000 r 60,000
They were all over the place on our trucks. Anywhere from 80k- 120k.
did this and everything sounded good. took it to get gas and then when i drove back home, it started shifting weird then downshifting hard. anyone else have this issue? i don’t know how shifting has anything to do with the replacement
No, never had that issue. Sounds like your transmission is having trouble. These trucks are known for their transmission issues.
Helped me so much!!!! Thx!!!!
Glad it helped!
I disconnected the nagative battery for 20 mins and the issue continued..fan still on ..idk what the problem is??? Anyone ?
Did you replace the thermostat and temperature sensor?
I replace both come to find out the auto place gave me the wrong sensor..but I put in the right new one now were all set👍..thanks bud ur video help me
I disconnected the battery when I left last night. After replacing both parts and the same problem continues please Battery trick fix this truck 😂
The battery should be the issue. Did it work when you tried it?
Hell yeah.. Damn 10grand Snap on Zucker scanner wouldn't reset the ECM wasted money 🤑🤣🤣🤣 thanks again.
Thankyou
You’re welcome 😊
tha same super easy to fix..
Glad we could help!
Wished I would have seen this months ago…. $600. plus from dealership to replace and flush the system…🤬
Wow, this fix was less than $100!
My 2014 silverado had same issue
At least it's an easy fix!!
That help me so much thanks
You’re welcome! Glad we could help.
I just had this problem and mine stayed in v8 mode also anyone else had that happen
That's odd
Electrocuted by 12volt dc? 😂😂 i must b one lucky sob! Been automotive wrenching professionally & shadetree for over 50 yrs. Made lots of sparks WITHOUT electrocution.
⚡⚡⚡⚡⚡⚡⚡⚡
Is bleeding the system not necessary?
Thermostat
🤙🙌
'17 Sierra 1500. Fans were running after engine was shut off. Replaced the sensor and the thermostat. Everything was back to normal. 2 weeks later and the fans are running again when shut off. Had a read done and it is saying I need to replace the relay. I have searched and searched and cannot find where a cooling fan relay is. Could it be called something else? @thebrothersworkshop
Did you disconnect and reconnect the battery? This is the typical culprit. If you are throwing codes, you may have a different issue all together. Our issue happened without triggering any codes.
Disconnecting the battery does nothing but reset the computer, but sooner or later the problem will come back even after replacing the parts
I've been dealing with this issue for over a year now, I've replace multiple sensors and thermostats (using oem and other brands) and problem comes back
The easy "fix" Disconnecting the battery for 5 min. And fans will go back to normal
@@Fernando-yk3hxlike
yeah, I have disconnected the battery and it does reset it. Finally was working for a while and now back to the same issue. Still reading as a fan relay issue but cannot find the location anywhere for it. Is it possible for a high pressure switch or water pump to be throwing off the temperature sensor?@@TheBrothersWorkshop