Engine Hot A/C Off

Tiny
TAHIRSHAH
  • MEMBER
  • 2008 GMC ACADIA
  • 3.6L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 100,000 MILES
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.
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Friday, December 27th, 2013 AT 10:18 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 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
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Friday, December 27th, 2013 AT 11:18 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 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
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Wednesday, August 12th, 2020 AT 10:49 PM

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