Engine Hot A/C Off

2008 GMC ACADIA

100,000 MILES • 3.6L • 6 CYL • AWD • AUTOMATIC

TAHIRSHAH

MEMBER
1 POST

Hi,
While driving in the morning, outside 9 degree, after about 10 minutes I received a message that 'Engine Hot A/C Off'. It happened after turning on seat heater for about 2 minutes. I have driven car for about 130km then engine service light also turned on.
Appreciate if you could please advise.

Dec 27, 2013 at 10:18 AM

WRENCHTECH

✓ASE Certified Mechanic
20,761 POSTS

It's telling you the engine is overheating and you need to shut it off. If the engine isn't over heating it may be bad coolant sensor causing this. I would start by scanning the computer for codes to see what it is recording as a failure, this will give a starting point

See the guides below

https://www.2carpros.com/trouble_codes/obd2

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Dec 27, 2013 at 11:18 AM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 POSTS

Hi,

It seems as though the engine is overheating, but the idea that it happens when you turn the seat heater on is odd. What I suggest is to have the CAN bus system scanned. CAN stands for computer area network. If you do this, it should indicate if there is a break down in communication in the network and specifically where it is happening.

Here is a video showing how it's done:

https://youtu.be/InIlnsjOVFA

This is what I suggest. If you find it isn't related to the seat heater, let me know. Also, confirm coolant is full and clean.

Let me know what you find.

Joe

Aug 12, 2020 at 10:49 PM

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