When mine did this it was a oil sensor I had to have replaced

 

I have had this problem for over a year and had my car back to the Chevy dealer over 6 times. The first time they said it was the air sensor at a cost of $450. The next time they said it was they did not reset the computer right. The next time they thought it was the battery. The next time they had no idea. So I put a quick disconnect on my battery and every 6 to 9 hundred miles when the engine hot AC off message comes up I just reach under the hood and twist the disconnect and go do something for 5 min. And come back and twist it the other way and I am good for another 600 to 900 miles.
This is what I had to do to keep my sanity.

 

Guys, The issue is the thermostat is opening too soon. The PCM has a fail-safe timer on engine temperature. If the engine doesn't hit a certain temp in a certain number of minutes, it throws out that message and turns on all the cooling fans under the hood in case the temperature sensor is giving faulty info.

Replace the thermostat and your problem will be solved.

 

This happens instentanios with the starting of the car. There is no time period.

 

Well I haven't responded to this thread since 2011 but I've read through the numerous postings and feel for everyone that has this issue. Personally, I gave the local dealership several attempts to fix the problem since 2011 but all they kept doing was resetting the computer on the car each time it happened and tried to charge me for it each time I took it to them. I eventually found a small mechanic in town that said they had dealt with this issue several times so they replaced the following items on my 2010 Chevrolet Impala:

1. coolant temp sensor
2. SL-N-connector wiring harness
3. thermostat with o-ring

I had this done back in February (2015) and haven't had any issues since then (knock on wood). It ended up costing me about $350 (parts and labor) but my frustration with this issue is hopefully over. I think the issue is more with the sensor and the wiring harness but that's just my opinion as I am not a mechanic...

 

[QUOTE=mikeye;164469]on dash where the odometer is this popped up engine hot ac off. the temp guage reads cold and stays on cold. the engine fan is running. whats going on?[/QUOTE
Did you find out a solution?

 

This is to Neil Montgomery, thanks for that bandaid: it worked! I like in Texas and it's 100 plus here. I had no AC while my thermostat was acting crazy. I changed the thermostat, flushed the cooling system, nothing worked.Thanks to you my wife and I won't have to suffer. I'm more concerned about my wife because she has some medical issues. So thanks again Neil!

 

In the past two months, I have replaced water pump, thermostat, radiator and AC compressor. and still getting the error

 

Today my Temp gauge stop working and I got the message that the Engine is Hot AC off. I haven't had this issue at all. Today is a colder day compared to what it has been during the summer. Today i also used my remote start for the the first time in about a month. Any reason As to why this is happening?

 

Welcome to the forums, Impala2008! We’re sorry to hear that your vehicle has been experiencing this A/C concern, and would like to look further into this situation for you. Please send us a private message with your VIN, mileage, contact information, preferred dealership for further assistance.

Have a wonderful day!

Helen
Chevrolet Customer Care