Air temperature gauge

JESSICA MATUSIK MARLATT

MEMBER
2008 GMC ENVOY
4.2L
6 CYL
2WD
AUTOMATIC
120,000 MILES

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.

Saturday, September 15th, 2018 AT 11:20 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,602 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

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Monday, September 17th, 2018 AT 12:41 PM

JESSICA MATUSIK MARLATT

MEMBER
2 POSTS

The inside gauge.

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Wednesday, September 19th, 2018 AT 7:26 AM

KEN L

MASTER CERTIFIED MECHANIC
47,602 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

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