What could be causing engine hot turn ac off message

Asked by Damon Jun 28, 2022 at 03:21 AM about the 2010 Chevrolet Impala LT FWD

Question type: Maintenance & Repair

Okay so this has been been a problem on and
off for about a year now. I’ve had the radiator
flushed, thermostat replaced twice, replaced
coolant temp sensor, I have also checked
spark plugs and other various things to verify
head gasket isn’t blown. The heat still works
and so does the ac when this message pops
up. The temp gauge drops below cold and
does not read. The vehicle only has 42k miles
on it has never been beaten on or driven hard.
I don’t know where to go next. Could it be a
bad ground? Any advice would help Thank
you in advance.

1 Answer
157,615

James answered 2 years ago

Sounds like you have a bad connection in the wiring going to the coolant temperature sensor. This would explain the temperature gauge on the dash dropping to cold and the engine hot message. When the computer loses the signal from the coolant temperature sensor it assumes the engine is overheating and takes steps to prevent serious engine damage such as disabling the air conditioner. Also, GMs for some reason don't like aftermarket coolant temperature sensors. Replace it with an AC Delco sensor and check the wiring going to the sensor. Hope that helps! Jim

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