Air temperature gauge

2008 GMC ENVOY

120,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC

JESSICA MATUSIK MARLATT

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The temperature gauge does not show any temperature, the air conditioner will not click on when it does it, it will come on randomly and then the air conditioner will work.

Sep 15, 2018 at 11:20 AM

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STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

Hello,

Can I ask if the temperature gauge you are referring to is outside temperature or climate control temperature? (What you set)

Please let me know, Ken

Sep 17, 2018 at 12:41 PM

JESSICA MATUSIK MARLATT

MEMBER
2 POSTS

The inside gauge.

Sep 19, 2018 at 7:26 AM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

It sounds like you have an ambient temperature sensor that is out. There are two for this system or the controller is going out. I would remove the sensors to check the electrical connections for corrosion caused by moisture first. Here are the sensor locations and the air conditioner wiring diagrams so you can see how the system works. You can also have the HVAC system scanned at the shop for a trouble codes it should cost about $70.00.

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Images (Click to enlarge)

Sep 20, 2018 at 3:41 PM