Hey guys I saw plenty of videos of this problem. I have a 2013 Chevy Silverado work truck with a 4.3L. To keep long story short I had same issue. I replaced thermostat and coolant temperature sensor with Advance auto parts products to fix the problem, and it did but only for 2 days. As I was driving on the highway the message came back. The permanent fix is to replace the thermostat with a AC Delco brand. I have absolutely no clue why the aftermarket thermostat doesn’t fix the issue but I can guarantee the OEM thermostat does the trick. Going a couple of weeks and a couple of hundred miles under the new ac delco thermostat and issue has not come back. Hopefully it stays that way.
From the research I’ve been doing today, since I’m having the same issue in my 07 Tahoe, THAT I BOUGHT YESTERDAY 🤬 the after market thermostats aren’t rated for 210
Thank you for this video. My 2011 Silverado has been doing this off and on for two years, it also caused my heater not to work. Watched your video, spent $6.99 on a new thermostat, ten minutes total work time and everything is working perfectly again.
I live in Ohio and I've never seen a coolant apparatus like that. I have a yellow funnel with attachments that fits most makes and models. I've been a mechanic for 25 years. Love your Channel!! Keep up the good work!
it scare the hell of me while on highway and 170 miles from home . stop the car at road side and check the cooling and engine work fine , that decided took a risk continue drive home. that 170 miles is likes my heart will pop out !
It’s usually the sensor or wiring, most likely wiring damaged by heat. I don’t think this video is correct in it’s diagnosis. But we will never know. Fake news.
Great video, Tim! The wife and I both drive Chevy Trailblazers (hers is a '06, mine is an '04) and I've learned a bunch from your channel! Keep up the good work! As L.A. Marzulli says "I'll see you on the air, or in the air!"
Great video thanks for your help i have a 2007 yukon and I did everything like you said it and now my truck is work great with out that code bless you!!
I have a 2013 Silverado with that 4.3 L V6 engine. I have those exact problems & the electric cooling fans run full speed. I've been told the temp sensor is no good. I got one of those code reader gauges that also reads live data streams from the PCM and it's showing me the engine temp of 171*F. I unplug the temp sensor and the gauge shows -40*F. Plug it back in and it's back to 171*F. I've also had issues this last winter with snow & ice building up in the engine compartment. Never had that in previous winters. The cooling system was flushed & refilled with new Dexcool last summer. Your video is saving me lots of money as I will replace the thermostat myself. What do you recommend for hose clamps? I'd like to save as much coolant as possible without draining the entire system & getting air locks.
You can bypass coolant temperature sensor just unplug it put a paperclip in each end of the plug to complete the circuit. The fan will run all the time but that's okay
Could u see some help got 09 Silverado low coolant level is on on dash ..bottle is full of antifreeze no sensor in bottle no overheating good heat ...any suggestions to get it off
Had a question on this. If we've already replaced both the thermostat, and temp sensor, where else should we check on the harness for an intermittent issue of this nature? On my truck, I believe it is a bad ground, because I get static on AM stations when hitting bumps in the road.
So from the research I've gathered apparently it's a either a faulty BCM or where it connects to the BCM is faulty. Especially if it's intermittent. I haven't found the issue yet but every time it comes on I just clear the code with a readers and go on about my day lol. I've changed everything else as far as Thermostat and all that.
Had a question on this if we ve already replaced both the thermostat and temp sensor where else should we chek on the harness for an intermittent issue of this nature on my truck i belive it is ground becuse l get static on A M stations when hitting bumps imthe road
My engine fans turn on on a cold start and never turn off. No matter the engine temp. It's not relays or fuses. I changed the temp sensor and still the fans run constantly. 08 silverado with the l76 6.0 engine
2008 silverado W/T 4.3.....I did the thermostat(stuck wide open), disconnected the battery for a few minutes...engine light returned next day.....changed sensor, wire and plug appeared to be in good shape.....engine light returned. Any ideas? Is the code removed by battery disconnect or is it stored and has to be manually removed by computer? Any ideas would be appreciated
The permanent fix is to replace the thermostat with a AC Delco brand. I have absolutely no clue why the aftermarket thermostat doesn’t fix the issue but I can guarantee the OEM thermostat does the trick. Going a couple of weeks and a couple of hundred miles under the new ac delco thermostat and issue has not come back. Hopefully it stays that way.
Genuine OE Part made by Gates. GM does recommend not using roloc wheels or the like on and metal surface mounting surfaces. Actually stumbled across a tsb the other day where they recommended this. Thought it was rather odd myself given all the years we've always just cleaned that gasket.
haven't ran across that tsb but not surprised. Not sure why that would apply to the metal housing but who knows. Seems like it sealed up good this time. Thanks for the info
And i thought the thermometer device had gone bad and telling the computer it was red hot all the time lol. Did the recent heatwave have any effect where you are? maybe 1 degree up as a tease lol.
my radiator had a crack, got it replaced. still overheated. didnt have a thermostat, bought a new one and installed. overheated faster. water pump was leaking replaced it reinstalled stat after i removed it. had a cloud of white smoke. that tells me my head gaskets blown. bought a gasket sealer. removed stat to prevent it from getting clogged when i poured the sealer. sealer worked, no more smoke. reinstalled the stat. no overheating. that didnt last long. started overheating, im thinking of replacing the temp sensor. but something tells me the coolant (its mostly water now) isnt circulating. thinking of removing the stat and testing, but were having bad luck, all our other vehicles are in the shop., so this is our only "working" vehicle. i dont want to keep putting money into this vehicle but i need it to work as its our only vehicle. ive already bled it many times. both rad hoses get hot. any thoughts?
The Car Doctor,, I had the first generation of those from Snap On a handful of years ago and they were totally garbage. After that I got the set Cornwell was selling,, been over 5 years and there still working👍🏻👍🏻👍🏻 If that Snap On tool lets you down there are alternatives.
Almost a year later and this also runs true for the 2009 Chevy Colorado 5 cylinder as well. Thermostat was wide open and would not allow the AC to come on.
Just had a 2011 chevy impala v6.. Same code and simptom. P0128 is 99.8% a thermostat..if it sticks open it can stick closed. And cause over temp condition and that's why the pcm cuts off AC, and gives you DIC information.
My 2014 gmc savanna 2500 4,8 L template goes up to 260 deg but the lines not hot, the coolant not hot, I changed the Thermostat but still goes to 260 and gives error code Turn of AC maybe the radiator sensor 😢
@Thecardoctor hey I have a question about my 01 Chevy Silverado my dash board is not showing my engine temperature or telling me what gear I'm in nor my millage nd da battery light is still on and the a/c or heater doesn't cut on at all. I did a diagnostic test on the truck and the battery and alternator are good and my fuses are good and I changed my spark plugs but it's still messed up. Do you know what's wrong your help would be appreciated
Had loss of water on '07 Tahoe 5.3. over time, lost a little over a gallon, then would heat up.. top it off and all fine for a few months. Finally noticed signs of water pump seepage. Also found overflow tube in tank was cracked.. neither leak enough to notice. Changed water pump and tank. Still had fluctuation issues. Changed thermostat and sending unit... Still issues, as in up to 235°, would cool very fast if rev up to 2k... But at a drive up window or coasting down hill.. it went back up. Played with thermostat, cut old one up and reinstalled.. damn computers!!! Runs nice temp, but throws the AC off code. Modified new stat.. couple of 1/8 holes. Works great!! But... In the morning, it takes too long to heat up, so the computer still shuts it down.. plugged one hole, still fine, but tomorrow morning will be the test... Yes, EVERYTHING has been tested!! Pressure tested. Vacuum tested... No indication of a crack or head gasket issue.. BTW, I am not the only mechanic that has worked on it.. two of my friends have helped.. read countless things on the internet, watched many videos... Been the biggest pain in the arse we've ever encountered!! Any ideas would be greatly appreciated!!!
ever find a solution? i took the thermostat OUT of mine and still same message , scan tool reads 180 deg, while dash message is saying engine hot but not according to the gouge or scanner
@@leejames2605 not really. Biggest thing is, Don't do old school!! We dumped some water glass in it, seems heater cores are primary cooling. Plugged them up.. they're a pain to change!! Pre '90s is so much easier!!
I’d tchamge the hose that looks like a Y at the bottom think it goes to the water pump and the thermostat too been replaced tan for a few days and then it comes back a/c turned off engine heating up
I’m having this same issue, engine hot AC off message, no temperature gauge, and Fan spinning super fast and loud, but before it happened I was having some kind of fuel problem cause I was driving on the highway and suddenly the throttle does fully respond, I had to slightly touch it with my foot so the truck doesn’t choke and on little incline it would god very slow like 15mph, so after couple miles of driving it gave this exact fail, I shut it off for like 5 minutes and the hot engine message, fan and temp gauge were still there but I got a little more power I manage to drive it back home, so once I arrived I took off the positive of the battery for a few minutes then back on so I started the truck and the message was gone as well as the fan and the temp gauge, but I haven’t driven it yet. What could it be?
Tried all of that didn’t work just came back on , no a/c changed coolant temp from dealer , also thermostat from dealer still no go. Once u disconnect battery or fuse a/c work temp works mr. Franklin
I just changed all the plugs in my 08 Avalanche as I have been having fuel/air issues. As soon as I fired up the truck after changing the spark plugs the "engine hot ac off" warning came on. What could have caused this?? Help! Lol
This is the second engine i have had in this truck with the same damn problem as well as several other problems. First was original motor that had 90k on it when i got it, at 150k i replaced the transmission and motor; motor was a reman from a totaled truck that the owner just had installed 9k miles before. It i took the computer, wiring harness, motor and everything hooked to it, and still i have the same damn acnoff message. Smh
I have an 08 sierra 1500 5.3l, and i watched a kid fix it by removing a fuse for 30 sec and putting it back and it fixed my problem, i just watched the video and went straight to the fuse and didnt get the name of the dang fuse hope this helps a little good luck
I have a 2012 Silverado with a 4.8 with the same message on the dash, I changed to CTS first, appeard to be fixed, it did it again, changed the thermostat, appeared to be fixed, a few days later did it again, changed the CTS connector, appeared to be fixed for days, it did it again this morning for 2 hours, now everything is back to normal again.
@universalservicetechust3578 The problem ended up being that it wasn't reaching operating temperature quick enough. The computer gives it 9 or 10 minutes, if it hasn't reached a certain temp by that time, it goes into a fail-safe mode.
Currently going through this issue. I change coolant temp sensor the thermostat. And still displaying the message. When I cut it off it’s hesitant to start. Please help!
You ever get it fixed? I noticed my truck was having a to crank a few times before it would start. Then a couple days later my temp gauge went dead. I replaced the thermostat and the coolant temp sensor and cleared the code and the fan still runs full speed and the temp gauge still won't work and my AC won't blow cold. I'm all out of ideas.
What an awesome great video. (I really do like this video.) Will, it hurt to run the truck at 160 degrees? (I like the hose remover clamp). That sure made life easier. It's a pain to crawl under the truck and pull the bottom hoses off, lol. Tim, I hope you and your family had a Blessed Easter weekend. God bless You All. Thank you for sharing the video.
Thanks Thomas. I know it’s always best to operate a vehicle at its normal operating temp to keep it in closed loop operation among other things. At 160F up here it wouldn’t thaw the windows in winter. Thanks for dropping by as always sir.
I need help! I have a 2010 Silverado, 1500WT . New thermostat, new sensor, still showing a message of Engine Hot A/C off. Please, can someone tell me what is going on?
Check fluid level first!!! Then for a frade wire at temp sensor!! If not the fix then replace thermostat, if still not the fix the only thing left is water pump!!
@@LH81633 Thank you, I am still having trouble with the light coming on. But, it doesn't run hot. I'm about ready to throw my hands up. We've done it all, but still having trouble.
O ring on t stat is plenty enough. As all GM has o ring on t stats as standard. As the surface area is minimal, a lip around the top hose is good for the o ring.
Did you check temp sensor for frade wires!! If you changed thermostat/checked for frade wires and temp sensor only thing left is the pump!!!by the way if problem is fixed codes go away by it self!!!
Its not that its the fuse box!! You have to unclamp the fuse box them apply dielectric grease to the terminals specially the one that has the big red wire from the battery and boob problem fixed
@@ThecardoctorTV well, I did a thermostat, water temp sensor, and replaced the water temp sensor pig tail. Cleared the codes and it still comes back shortly after. Any suggestions? I’m a pretty decent mech and I’m at a loss on this one. Seems it may only happen when I have the block heater is plugged in beings it’s been well below zero here in ND lately. Any input appreciated!
I put off buying those clamp pliers for sooo long! I still forget to use them sometimes and pull out the junker ones I’ve used for years. I’m such a cheap skate. When I retire I’m pretty sure the museum will want my tools for a exhibit.
Hello, I have a problem with my silverado v6, I already changed the temperature sensor and I already changed the thermostat and the fault comes back in a few days, when the engine hot ac off appears I disconnect the battery 5 minutes and I connect it and it works again perfectly and in some days come back help please
Hey guys I saw plenty of videos of this problem. I have a 2013 Chevy Silverado work truck with a 4.3L. To keep long story short I had same issue. I replaced thermostat and coolant temperature sensor with Advance auto parts products to fix the problem, and it did but only for 2 days. As I was driving on the highway the message came back. The permanent fix is to replace the thermostat with a AC Delco brand. I have absolutely no clue why the aftermarket thermostat doesn’t fix the issue but I can guarantee the OEM thermostat does the trick. Going a couple of weeks and a couple of hundred miles under the new ac delco thermostat and issue has not come back. Hopefully it stays that way.
Thank you I was having the same problem
how is it doing now? im having the same problem and even ran without a thermostat , still same issue
From the research I’ve been doing today, since I’m having the same issue in my 07 Tahoe, THAT I BOUGHT YESTERDAY 🤬 the after market thermostats aren’t rated for 210
Thank you for this video. My 2011 Silverado has been doing this off and on for two years, it also caused my heater not to work. Watched your video, spent $6.99 on a new thermostat, ten minutes total work time and everything is working perfectly again.
Thank you my 5.3 just did the same thing to me could not figure it out until i watched your video thank you car doctor.
I only do those thermostats when the coolant is boiling hot, make the job more exciting! ;)
Yes I got ya, the hotter the better. Haha. Ouch
You give me a good idea thanks
😂
I live in Ohio and I've never seen a coolant apparatus like that. I have a yellow funnel with attachments that fits most makes and models.
I've been a mechanic for 25 years.
Love your Channel!!
Keep up the good work!
it scare the hell of me while on highway and 170 miles from home .
stop the car at road side and check the cooling and engine work fine , that decided took a risk continue drive home. that 170 miles is likes my heart will pop out !
Another OUTSTANDING repair Car Dr. A master at his craft. Days are getting long and fishing season is soon.
Fish on buddy! Thank you.
@@ThecardoctorTV ola amigo tengo una Chevy asilberaso 2011 sube la temperatura a más de 210 eso es normal
Same issue with my 2007 yukon Denali 6.2. Temp sensor at the block had a loose connection. Check that first.
It’s usually the sensor or wiring, most likely wiring damaged by heat. I don’t think this video is correct in it’s diagnosis. But we will never know. Fake news.
Great video, Tim! The wife and I both drive Chevy Trailblazers (hers is a '06, mine is an '04) and I've learned a bunch from your channel! Keep up the good work! As L.A. Marzulli says "I'll see you on the air, or in the air!"
*GREAT VIDEO --- best on GM vehicles is here!!!*
Thank you.
Wouldn’t think there would be too much demand for an air-conditioner in Alaska. 😃😃 ,, Great Video Tim👍🏻👍🏻👍🏻👍🏻👍🏻
You would be mistaken. Your A/C is used to dry the air for your window defroster. Would have to think that is used more often than most anywhere else.
Thanks for the video, how do you like those hose pliers?
Thanks so much for this. I was stranded because my truck wouldn’t even crank. I cleared the code and problem solved until I can change the thermostat
Great video thanks for your help i have a 2007 yukon and I did everything like you said it and now my truck is work great with out that code bless you!!
Got one with a v8 and it’s doing it.. same code. Thanks for the vid
How’d it go ?
I have a 2013 Silverado with that 4.3 L V6 engine. I have those exact problems & the electric cooling fans run full speed. I've been told the temp sensor is no good. I got one of those code reader gauges that also reads live data streams from the PCM and it's showing me the engine temp of 171*F. I unplug the temp sensor and the gauge shows -40*F. Plug it back in and it's back to 171*F. I've also had issues this last winter with snow & ice building up in the engine compartment. Never had that in previous winters. The cooling system was flushed & refilled with new Dexcool last summer.
Your video is saving me lots of money as I will replace the thermostat myself. What do you recommend for hose clamps? I'd like to save as much coolant as possible without draining the entire system & getting air locks.
did that fix your problem?
@@leejames2605 - Yes, the thermostat was the issue.
Enjoy watching your vids as you explain it to the tee. Keep them coming.
Thank you, im glad you watch!
This video was extremely helpful for my 2013 Silverado. Thank you!!!👍🙂
When I change the thermostat do I need to still flush the radiator as well?
Great repair and excellent part brand choice. How ever I was a little disappointed to not get to see any dorman in this one though lol.
I’m sure we can incorporate some Dorman bling into our next production. I know it’s a viewer favorite. Haha.
The Car Doctor ahh good I’ll be looking forward to it lmao.
Always great videos and information from the Doctor! Thanks!
Thank you Rick.
Hose clamp tool is nice
My 08 express 3500 6.0 does this all the time. Pull the ECM fuse for 10 seconds and everything goes back to normal. ECM quirk.
So this truck was showing hot engine and ac off but temp gauge set cold? Was the actual problem the thermostat stuck open?
Thanks for your time and I hope this fixes my problem on my 2009
do have that link for that air bleeder tool? great video by the way...
So I had the thermostat and the sensor replaced and it's still doing it what else could it be
Did you end up finding put the problem because I’m having the same problem
Happened to my 2008 Silverado replaced the coolant temp sensor and was good to go no issues since.
You can bypass coolant temperature sensor just unplug it put a paperclip in each end of the plug to complete the circuit. The fan will run all the time but that's okay
Alex Tom Tom then the light came back!!! Couple days later!!!!
Could u see some help got 09 Silverado low coolant level is on on dash ..bottle is full of antifreeze no sensor in bottle no overheating good heat ...any suggestions to get it off
I need your help my chevy silverado when I star dri ver the fan not active in hi and my is very hot do you answer my cuestion?
Had a question on this. If we've already replaced both the thermostat, and temp sensor, where else should we check on the harness for an intermittent issue of this nature? On my truck, I believe it is a bad ground, because I get static on AM stations when hitting bumps in the road.
I’ve changed all that and the harness still won’t work
So from the research I've gathered apparently it's a either a faulty BCM or where it connects to the BCM is faulty. Especially if it's intermittent. I haven't found the issue yet but every time it comes on I just clear the code with a readers and go on about my day lol. I've changed everything else as far as Thermostat and all that.
Had a question on this if we ve already replaced both the thermostat and temp sensor where else should we chek on the harness for an intermittent issue of this nature on my truck i belive it is ground becuse l get static on A M stations when hitting bumps imthe road
@@RICARDORODRIGUEZ-on6nj did you find the problem yet?
GM have always had issues with thermostats sticking open. I've changed several of them over the years.
Great repair video Car Doctor
My engine fans turn on on a cold start and never turn off. No matter the engine temp. It's not relays or fuses. I changed the temp sensor and still the fans run constantly. 08 silverado with the l76 6.0 engine
2008 silverado W/T 4.3.....I did the thermostat(stuck wide open), disconnected the battery for a few minutes...engine light returned next day.....changed sensor, wire and plug appeared to be in good shape.....engine light returned. Any ideas? Is the code removed by battery disconnect or is it stored and has to be manually removed by computer? Any ideas would be appreciated
The permanent fix is to replace the thermostat with a AC Delco brand. I have absolutely no clue why the aftermarket thermostat doesn’t fix the issue but I can guarantee the OEM thermostat does the trick. Going a couple of weeks and a couple of hundred miles under the new ac delco thermostat and issue has not come back. Hopefully it stays that way.
@@jesseaguilar8758 If you remove the #12 fuse for 10 seconds it will clear the message.
@@c450r211 but that’s not a permanent fix
@@jesseaguilar8758 I replaced the thermostat with genuine GM and replaced the coolant temp sensor and still have the issue.
This video needs an updated there is people still having the same problem. Check down thru the comments you see.
Great job and explanation on video 🙏got to learn a lot thank you man
Awesome video sir ! Thanks for sharing.
Genuine OE Part made by Gates.
GM does recommend not using roloc wheels or the like on and metal surface mounting surfaces. Actually stumbled across a tsb the other day where they recommended this. Thought it was rather odd myself given all the years we've always just cleaned that gasket.
haven't ran across that tsb but not surprised. Not sure why that would apply to the metal housing but who knows. Seems like it sealed up good this time. Thanks for the info
Apparently I need a thermostat. I replaced temp sender already. Thanks 👍
Did the code come back?....i bet it did......lmk
Somewhat a little shade tree petcock for draining coolant first then work begins thermostat,hoses and temp sensor for complete coolant service
And i thought the thermometer device had gone bad and telling the computer it was red hot all the time lol.
Did the recent heatwave have any effect where you are? maybe 1 degree up as a tease lol.
Other symptom i had was the radiator fans revved up a lot
my radiator had a crack, got it replaced. still overheated. didnt have a thermostat, bought a new one and installed. overheated faster. water pump was leaking replaced it reinstalled stat after i removed it. had a cloud of white smoke. that tells me my head gaskets blown. bought a gasket sealer. removed stat to prevent it from getting clogged when i poured the sealer. sealer worked, no more smoke. reinstalled the stat. no overheating. that didnt last long. started overheating, im thinking of replacing the temp sensor. but something tells me the coolant (its mostly water now) isnt circulating. thinking of removing the stat and testing, but were having bad luck, all our other vehicles are in the shop., so this is our only "working" vehicle. i dont want to keep putting money into this vehicle but i need it to work as its our only vehicle. ive already bled it many times. both rad hoses get hot. any thoughts?
Hi CAR DOCTOR what brand of HOSE CLAMP pliers you using?
That’s the snapon brand pliers. So far so good. Not super cheap but the off brand ones I had were garbage.
@@ThecardoctorTV Thank you !!! 👍
The Car Doctor,, I had the first generation of those from Snap On a handful of years ago and they were totally garbage. After that I got the set Cornwell was selling,, been over 5 years and there still working👍🏻👍🏻👍🏻 If that Snap On tool lets you down there are alternatives.
No links to tools in description like stated
OH thanks, ill add that. Blessings
@@ThecardoctorTV no problem car doctor blessings back
Great video..... thank you for your help!
If the thermostats sticks, why get an OEM AC Delco again ? There are probably better ones out there ?
I recently put a new thermostat and coolant sensor. I’m still getting the p0128 code it won’t reset with the scanner. What else can be the issue?
If it wont reset with scanner, try disconnecting battery for 10 mins.
Almost a year later and this also runs true for the 2009 Chevy Colorado 5 cylinder as well. Thermostat was wide open and would not allow the AC to come on.
Crazy. What a crap design.
Just had a 2011 chevy impala v6.. Same code and simptom. P0128 is 99.8% a thermostat..if it sticks open it can stick closed. And cause over temp condition and that's why the pcm cuts off AC, and gives you DIC information.
My 2014 gmc savanna 2500 4,8 L template goes up to 260 deg but the lines not hot, the coolant not hot, I changed the Thermostat but still goes to 260 and gives error code Turn of AC maybe the radiator sensor 😢
Maybe a faulty temp sensor?
Can you change the thermostat without bleeding the coolant
Probably not
I'm wondering that too!?
@Thecardoctor hey I have a question about my 01 Chevy Silverado my dash board is not showing my engine temperature or telling me what gear I'm in nor my millage nd da battery light is still on and the a/c or heater doesn't cut on at all. I did a diagnostic test on the truck and the battery and alternator are good and my fuses are good and I changed my spark plugs but it's still messed up. Do you know what's wrong your help would be appreciated
I have no idea but im guessing at least the cluster needs repair.
How can you check the ac with it on hot and open vents? That just makes no sense
Had loss of water on '07 Tahoe 5.3. over time, lost a little over a gallon, then would heat up.. top it off and all fine for a few months.
Finally noticed signs of water pump seepage. Also found overflow tube in tank was cracked.. neither leak enough to notice.
Changed water pump and tank.
Still had fluctuation issues. Changed thermostat and sending unit... Still issues, as in up to 235°, would cool very fast if rev up to 2k... But at a drive up window or coasting down hill.. it went back up.
Played with thermostat, cut old one up and reinstalled.. damn computers!!! Runs nice temp, but throws the AC off code.
Modified new stat.. couple of 1/8 holes. Works great!! But...
In the morning, it takes too long to heat up, so the computer still shuts it down.. plugged one hole, still fine, but tomorrow morning will be the test...
Yes, EVERYTHING has been tested!!
Pressure tested. Vacuum tested...
No indication of a crack or head gasket issue..
BTW, I am not the only mechanic that has worked on it.. two of my friends have helped.. read countless things on the internet, watched many videos...
Been the biggest pain in the arse we've ever encountered!!
Any ideas would be greatly appreciated!!!
ever find a solution? i took the thermostat OUT of mine and still same message , scan tool reads 180 deg, while dash message is saying engine hot but not according to the gouge or scanner
@@leejames2605 not really. Biggest thing is, Don't do old school!!
We dumped some water glass in it, seems heater cores are primary cooling. Plugged them up.. they're a pain to change!! Pre '90s is so much easier!!
I’d tchamge the hose that looks like a Y at the bottom think it goes to the water pump and the thermostat too been replaced tan for a few days and then it comes back a/c turned off engine heating up
I’m having this same issue, engine hot AC off message, no temperature gauge, and Fan spinning super fast and loud, but before it happened I was having some kind of fuel problem cause I was driving on the highway and suddenly the throttle does fully respond, I had to slightly touch it with my foot so the truck doesn’t choke and on little incline it would god very slow like 15mph, so after couple miles of driving it gave this exact fail, I shut it off for like 5 minutes and the hot engine message, fan and temp gauge were still there but I got a little more power I manage to drive it back home, so once I arrived I took off the positive of the battery for a few minutes then back on so I started the truck and the message was gone as well as the fan and the temp gauge, but I haven’t driven it yet. What could it be?
Can you change the therm and not bleed all the coolant? Just top it off after?
I just put it in a bucket
I got a 2011 Silverado. I changed thermostat and temperature sensor and it still does it.
Same. Did you get it resolved?
Tried all of that didn’t work just came back on , no a/c changed coolant temp from dealer , also thermostat from dealer still no go. Once u disconnect battery or fuse a/c work temp works mr. Franklin
Yes, you must clear the codes for the message to go away.
I just changed all the plugs in my 08 Avalanche as I have been having fuel/air issues. As soon as I fired up the truck after changing the spark plugs the "engine hot ac off" warning came on. What could have caused this?? Help! Lol
Thanks Tim!
I did this about 2 weeks ago, followed you step by step and it's doing it again. Any idea what the issue would be?
Likely the temp sensor, or an electrical issue like mine
True the ac compresser fuse
Try*
Very good work
Thank you very much
This video was very usefull for me
Awesome!
Love the clamp tool......
did you bleed the system?
I changed the thermostat on my 2010 chevy suburban ltz but the the engine hot is still on the dash board what do I do next to fix the issue
Hey Gaspar. What brand did you use.
This is the second engine i have had in this truck with the same damn problem as well as several other problems. First was original motor that had 90k on it when i got it, at 150k i replaced the transmission and motor; motor was a reman from a totaled truck that the owner just had installed 9k miles before. It i took the computer, wiring harness, motor and everything hooked to it, and still i have the same damn acnoff message. Smh
I took my 08 gmc Sierra in yesterday for this and they Changed my sensor it didn't fix it
I have an 08 sierra 1500 5.3l, and i watched a kid fix it by removing a fuse for 30 sec and putting it back and it fixed my problem, i just watched the video and went straight to the fuse and didnt get the name of the dang fuse hope this helps a little good luck
So what if you put in a new thermostat & coolant & still get that reading on the dash
Same issue that I have. It only comes on when I drive over 55 MPH for longer that 20 minutes. It town driving it never comes on.
I am going to try it. Thank you
I have a 2012 Silverado with a 4.8 with the same message on the dash,
I changed to CTS first,
appeard to be fixed, it did it again,
changed the thermostat, appeared to be fixed, a few days later did it again,
changed the CTS connector,
appeared to be fixed for days,
it did it again this morning for 2 hours, now everything is back to normal again.
what was your fix?
WhT 😮
@universalservicetechust3578 The problem ended up being that it wasn't reaching operating temperature quick enough. The computer gives it 9 or 10 minutes, if it hasn't reached a certain temp by that time, it goes into a fail-safe mode.
Can we leave the thermostat out and not put it back in like the old cars ?
You can but it will throw the code, also it's not good to run the car below Optemp
Thxs Tim good info..
Currently going through this issue. I change coolant temp sensor the thermostat. And still displaying the message. When I cut it off it’s hesitant to start. Please help!
You ever get it fixed? I noticed my truck was having a to crank a few times before it would start. Then a couple days later my temp gauge went dead. I replaced the thermostat and the coolant temp sensor and cleared the code and the fan still runs full speed and the temp gauge still won't work and my AC won't blow cold. I'm all out of ideas.
@@oscarm534 I did! The wiring dry rotted where u snap the coolant temperature sensor on. Guy at the shop fixed it in like 2hrs
Still fixed for you?
rapido y sin tanta bronca
09 sierra 5.3 same symptoms same fix
What about when it turns the fan on for 4 minutes after turning off the car, even when engine is cold
Thanks so very much
Like you I use *OEM ACDELCO parts* always work.
Wheel bearing. I sure hope not, I just had a customer make me put an OE rack in her olds. Scary.
My 2009 Silverado temp gage rises and lowers when driving and intercooler was smoking what do i do
That’s not good. You having turbo issues?
What an awesome great video. (I really do like this video.) Will, it hurt to run the truck at 160 degrees? (I like the hose remover clamp). That sure made life easier. It's a pain to crawl under the truck and pull the bottom hoses off, lol. Tim, I hope you and your family had a Blessed Easter weekend. God bless You All. Thank you for sharing the video.
Thanks Thomas. I know it’s always best to operate a vehicle at its normal operating temp to keep it in closed loop operation among other things. At 160F up here it wouldn’t thaw the windows in winter. Thanks for dropping by as always sir.
@@ThecardoctorTV It's always a pleasure to stop by. Your videos are always the best. Bless you, my friend.
Thank you
I need help! I have a 2010 Silverado, 1500WT . New thermostat, new sensor, still showing a message of Engine Hot A/C off. Please, can someone tell me what is going on?
Check fluid level first!!! Then for a frade wire at temp sensor!! If not the fix then replace thermostat, if still not the fix the only thing left is water pump!!
@@LH81633 Thank you, I am still having trouble with the light coming on. But, it doesn't run hot. I'm about ready to throw my hands up. We've done it all, but still having trouble.
@@sandrawarren682 did you end up finding the problem
No gasket on the mounting surface, just a oring on the stat?
O ring on t stat is plenty enough. As all GM has o ring on t stats as standard.
As the surface area is minimal, a lip around the top hose is good for the o ring.
Tim you forgot the link for coolant filler.
I've done all that and erased the code. The problem comes back in a few days and my fans start running.
Did you check temp sensor for frade wires!! If you changed thermostat/checked for frade wires and temp sensor only thing left is the pump!!!by the way if problem is fixed codes go away by it self!!!
Its not that its the fuse box!! You have to unclamp the fuse box them apply dielectric grease to the terminals specially the one that has the big red wire from the battery and boob problem fixed
How does the computer know that a mechanical thermostat has failed? I don’t understand that.
Temp (sensor) stays low after a predetermined period of time when it should be higher.
@@ThecardoctorTV 10-4, thanks!
@@ThecardoctorTV well, I did a thermostat, water temp sensor, and replaced the water temp sensor pig tail. Cleared the codes and it still comes back shortly after. Any suggestions? I’m a pretty decent mech and I’m at a loss on this one. Seems it may only happen when I have the block heater is plugged in beings it’s been well below zero here in ND lately. Any input appreciated!
Engine Coolant Hot current temperature is 31 degrees hard freeze
Una pregunta ya le cambió el sensor y también el termostato y me sigue marcando lo mismo
Reset the computer
Si grasias ya galo asi
@@bonyperez6680 cual sensor ese el que se cambia
@@pedro-yl3vy el de la temperatura
changed out the thermostat message still on dash, and fan is constine running
Check the temp sensor.
My GMC Yukon XL v8 did it... The coolant temp sensor was bad... Swapped it out and it all went away lol
Tom Christensen temp sensor very unlikely to fail!!!! Bet it came back
Algien me podria desir donde se encuntra el desague de una sieerra 2008
Today I got the same problem with the GMC Envoy
Stubborn bugger aye? Oh and I like you hose clamp tool.
Good vid.
I put off buying those clamp pliers for sooo long! I still forget to use them sometimes and pull out the junker ones I’ve used for years. I’m such a cheap skate. When I retire I’m pretty sure the museum will want my tools for a exhibit.
@@ThecardoctorTV Yeah if ya only got one skate then ya are cheap cause it's hard to skate without two skates.
40 bux for the craftsman cable pliers. Love mine.
Hello, I have a problem with my silverado v6, I already changed the temperature sensor and I already changed the thermostat and the fault comes back in a few days, when the engine hot ac off appears I disconnect the battery 5 minutes and I connect it and it works again perfectly and in some days come back help please
same did you ever fix this
Nick Posterli NO , HELP me please
Try putting a new pig tail on that connects the wires to the coolant sensor
Is your engine taking a long time to warm up when cool outside
Nick Posterli hello try to clean the connectors, I'm going to test these days. The truck is at its normal temperature below a little below half.
mine had this problem today! we travelled a hour from our home & when we went to start it after shopping it kept on turning over :(
it’s also running high like when im in park the stick on the gauge is at about 1
What ended up being the problem?
should never cookie wheel a aluminum housing duh it wont seal again. Probably better not to put dexcool death back go green
2005 Chevy Silverado