ENGINE HOT AC OFF

Temperature coolant sensor you meant. Check the coolant level and check the hoses from the radiator if are hot (just touch and let go). This would show if the thermostat is ok. Also you could step out of the car and leave the interior fan on the highest mark to see if temperature is coming down. A bigger problem could be a blown headgasket...

Probably thermostat. Mines did same Engine hott/AC off. Took to dealer changed thermostat problem went away

I just had the same problem this morning. My coolant wasn't low. I had the heat on high trying to warm my car. The engine didn't show signs of overheating and I added more coolant. Temperature hand is stock on cold. Pretty sure it went out...

How to turn the AC off

Hi my car get engine hot a/c off i ready change the themostane what else can can somebody help it 2012 chevy impala 3.6

Hi i have 2012 chevy impala 3.6 they get hot engine a/c off i ready change thr thermostat n still get hot

I changed both thermostat and temperature sensor

Mines works fine

my 06 impala is doing same thing I brought it to mechanic he checked temp with computer was only 180 one month later light comes on again yet its not hot can anyone help?

I have a 2008 Impala with just over 131,000 miles on it. Recently, I had this same problem, in addition to the engine light coming on. Took it to a dealer, said it was a bad thermostat, and the oil pressure sensor was causing the engine light to go off. Replaced both and that seemed to fix it. Two weeks later, both the message and the light come back on. I'm going to take it back to the dealer, but thought I'd see what people on here think

Received the same warning on my wife's 2008 Impala = engine hot/ AC off. She brought the car in to have the diagnostic done, and got a PO128 Code. If the engine doesn't maintain specific temp parameters(doesn't warm up fast enough/maintain temp), this warning will display. A little research on causes led me to the thermostat, and the service tech agreed that the thermostat was likely stuck open(even though the warning says the engine is hot, it's not.. the engine stays cool, upper radiator hose is cool, etc) When this warning is produced, the temp gauge will zero out.. that's why the gauge is all the way to the Left.. even when you start feeling cabin temp increase. In my case, I drained/recaptured/filtered coolant and replaced the thermostat in 20 minutes.(bought a Stant for $18 because the GM part was $74) After purging air, and letting the car run for about two minutes, the cabin air was warming, the code cleared itself, the temp gauge started to move, and the engine reached normal operating temp. There are obviously other things that can go wrong, but my favorite mechanic(thanks, Adam - Pebble Lake Auto!) suggested I start with the thermostat, and the problem was solved.

Mine just started with these signs .. my question is... can I still drive it ...? It’s a cold morning and it’s telling me engine is hot and turn off a/c, but I need to get to work !! Mines a 2011 impala

My 08 impala my heat went out and now these lights are on the traction, shift indicator, don't work, and the passenger side heater doesn't work. Can you please help thanks in advance.

2009 Impala 168k miles. Changed the thermostat and coolant. Fixed the problem.

Most problems are the plug up to cooling sencer. They are very delicate. Once you unplug them check to see if the red end is still on the plug up. If not replace the plug up.

I’m having the same issue the first time it was low on coolant I connected my odb2 and erased a evap can code I had already and nothing else showed up. Happened 4 days later and about 250 miles driven. Hey this time I did the same thing running late to work I just jumped in and started driving 80 mph. Again no new code. I connected my odb2 erased the codes and the temp is running normal again. Idk what it is but when I cold start my impala i can hear one of the pumps squeaking. I’m assuming it’s throwing me that code because of improper circulation on a cold start. Water pump maybe. If the thermostat reads normal after erasing the code. It’s not the thermostat. Changing the antifreeze isn’t going to help. More or less I think it has to be a computer issue a sensor is bad somewhere. I know a shop that’ll run a diagnostic on it for like $60. A lot more in- depth than having autozone run a odb2 on it. After Christmas I’ll have them check so I’m not spending money on parts I don’t need to replace. Some of these answers tho... doubt it’s a blown head gasket if there’s no water in the oil... red sludge on a recently bought used car in the radiator could mean stop leak and if u had a leak u need a new radiator. Stop leak is to get you home when u have a pin hole leak. My bet is on a sensor tho. It only happens when it’s 40 degrees outside and my heat is running in the morning. I suggest erasing the code to see if your thermostat is functioning before replacing it.

I diaconnected and reconnected the battery; all fixed now; but may meed new battery

I checked my codes again and it passed but I then checked pending codes and got a p0128 which most people online were saying it was a thermostat. I bought a fail safe for around 30$ and just finished the install. I’m in the middle of bleeding the lines 40sec 30sec 20sec revving it to 2500 rpm. Just let it run to normal running temperature and letting it cool off for another top off. I completely drained the system because I doubt it’s ever been done now it’s sitting with new antifreeze and new thermostat. hopefully I won’t see the engine hot warning again. My biggest issue was the p0128 never showed up before yesterday and it was under pending codes whatever that is. Unplugging the battery will just manually reset the computer without a code reader I think. My battery is only a few months old. My antifreeze looked pretty gross too so changing it was a plus. When I started it, it sounded so much better than it has in a while. Changing the coolant temperature sensor looks like a nightmare you have to remove more stuff than I care to touch. So fingers crossed I’ll update in a couple daze

It’s been about a week and about 300 miles maybe more and I no longer have issues after changing the thermostat not so sure my overflow tank is functioning tho I think it has to do with the orange antifreeze they recommend I use I went with the traditional green stuff btw after I drained everything I had clumps of stuff in the antifreeze like a gel substance so I’m staying away from the orange stuff from now on

I have had this problem with my 2010 Chevy impala for a couple of years now. Changing the temp coolant sensor didn't help. Mine is a problem off and on. I'll be having the problem for a couple of days and then all of a sudden I'll notice my temp gauge is working and it doesn't say engine hot a/c off anymore. I read somewhere on the net that a person thought that moisture might have something to do with this and I think he may be on to something. This problem seems to come up for me when the weather suddenly gets cold or rainy so it has to have something to do with it. Unfortunately when this happens it's very hard to defrost my car windows. DOES ANY OF THIS MAKE SENSE TO ANYONE OUT THERE???

Yes but my windows still defrost and my car warms up, but the needle just won’t move

After changing the temperature sensor 3 times over 8 months (It would work for a while and then the message would come back), I changed the thermostat and and that seems to have done the trick. In the future, if someone gets this message, I would suggest to change both the thermostat and temperature sensor at the same time and I think you will find this will fix your issue.

I replaced my block heater cord end with a normal plug to bypass the "temp switch" on it. I then started to get that code. I read on another thread the engine now sees the engine is hotter than the ambient temp it should be and shuts off the gage to protect it from going off scale. It thought it is due to an emissions standard

Had a similar thing happen with my 2013 Impala LTZ. Was driving to work early on a cool and wet morning and about halfway into my 15-minute drive I switched the climate control from cold to warm and shortly thereafter I saw a message in the gauge cluster saying "ENGINE HOT A/C OFF" and my temperature gauge went flat to "C" and RPMs stayed pretty low until I got to work. Fans were running like crazy when I parked and remained on after I shut the engine off, staying like that for about 3-5 minutes. Same thing happened on my way home that day. We ended up replacing the Coolant Temperature Sensor with an ACDelco GM version of the replacement (if you add your vehicle to your garage and then look for the part on Amazon it will show you the one that is right for your car). Wasn't hard to replace but we noticed that after the swap my battery was practically shot (we think because of how hard the fans were running when the engine was off). Had to jump the car and then took it for a spin after resetting the codes. No fan and temperature gauge was accurate. We replaced the sensor about a week ago and so far so good.

If anybody is still having this issue a quick reset of the computer will do the trick. Disconnect your battery terminals and hold them together for a few moments, stick them back on, and your thermostat should work again.

Another way is while you are driving turn your heater to high and heater fan on high let run for a few minutes code will turn off. I don't know why but that works on my 2007 GMC Sierra

I've had the same problem in my 2013 impala and in a 2009 malibu as well. The malibu didn't have a specific warning but the A/C would just arbitrarily cut out. Not fun in the Texas heat. A thermostat change cured the Malibu. An inner rubber gasket in the thermostat was allowing warm water to flow by the thermostat fooling the sensors into thinking it was overheating. Hoping it works for the Impala. I've been doing the battery disconnect reset thing but thats getting old. Noticed it happens more during cold weather so I'm thinking (hoping) its sensors. btw the engine temp sensor didn't cure either car.

Had the same problem engine hot/ Ac off today when I was heading out for work, did the trick unplugged the battery terminals hold them for few minutes and than plugged them back and it did work. Thanks GuruHG7RQ Thanks GuruHG7RQ

2010 Buick Lucerne. Engine hot a/c off. Added antifreeze. Drive 400 miles and the message appeared again. Anti freeze container was empty added more antifreeze. Happened a third time after 9 miles. No need to add antifreeze. Engine feels cool. Thermostat was changed two years ago

2010 Chevy impala overheating. Replaced thermostat. Checked coolant pressure, no leaks, radiator holding pressure. Noticed car overheated when the ac was on, the ac would automatically shut itself off and turn back on when start to drive. Ac compressor made a weird noise. So changed my whole ac system. Refilled with Freon, ac works good and compressor sounds way better. Car is still shutting off the ac when it’s hot (Phx), but car temp gauge doesn’t say car is overheating. Ac shuts off and on when stop and go traffic. Maybe replace the temperature sensor?? Suggests/help?

This is the exact thing that is happening to my car my a/c will shut off and on the light would blink and a/c will only blow cold if I’m driving but if I stop at a light it will blow strictly hot and my car starts to get hot.

In answer to the cars that are blowing cold when you stop and heat again when you are moving it is your heater flap..(not sure if this is the technical term..lol) it is the flap that opens and closes between a/c and heat and it's not closing all the way..etc...

well i have changed the coolant temperture switch and the thermostat , drove it cars ran finenoissue until i turned on the rear defroster ,then it pulledupturn ac offengine hot,i assume that the switch has a short somewhere in it , drives great without using the rear deforster

I have a 2006 impala and the code engine hot a/c off has come on twice now the first time it happened I googled it and found a post that said to disconnect the battery terminal so I thought I might as well try it cause it don't cost me nothing. Thought for sure I was going to have to call into work tell them I couldn't make it in but it took me 5 minutes taking off and putting back on the positive battery terminal and walla the error code was off and I made it to work on time. This happened again tonight same error engine hot ac off and my dial for hot and cold dial was stuck on the c my heater was blowing out hot air so I thought can't be my thermostat so unhooked my battery terminal and walla it worked again. I hope this works for others it sure was a blessing for me so I thought I would share it!

Mine only does this in winter. Its so frustrating. Coolant temp sensor didn't help. Guess I'll try the thermostat?

2013 same thing. 2 months ago, I drove car, engine hot a/c off light came on. I parked, waited a couple hours, knowing it's not overheated, had coolant & nothing. Got mad, did as expected, took battery cable off, waited a few minutes & it went away. Yes, just tricked the computer. But had to get a jump when I put the cables back on. Here I go again, this time it killed my battery but jump took not even a minute. 2morrow I'll do the cables again until I get it to my mechanic next week. BTW my a/c, heater stopped working after I just got mechanic, 6+ months ago, to fix the hot air coming out on the driver side I was getting, passenger side got the a/c. He said it has 2 blowers & the flap or whatever its called wasnt working properly. Good Luck to us all. Computers are for the birds.

I have a 2008 Chevy Impala and the ENG HOT, A/C OFF warning comes on like so many other Chevy Impala owners have reported. I changed the engine temperature sensor 3 times with a lifetime warranty off brand. I finally replaced it with a AC DELCO ( original equipment brand). This didn't help either. I can reset the the message by disconnecting the positive battery lead for 5 minutes. The engine temperature also starts working normally after each reset. So, it's not the engine temperature sensor. So, what is the problem? I'm wondering if it's the engine computer. If this is what is being reset maybe it's the problem. Chevy has a serious problem with the windows frosting up when the outside air temperature is below 39°F. This is a design problem because the air conditioning won't work at that point. Piss pour design. Chevrolet should be ashamed!