Front A/C vents do not blow cold air?

Tiny
BLONG60
  • MEMBER
  • 2015 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
Both front vents blow ambient air when turned to cool, and both sides blow hot when adjusted to hot.

All rear vents are cooling properly.

If I have a leak would the entire system run dry? Or could the leak be isolated to the front system.
Thursday, August 3rd, 2023 AT 8:16 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
I have seen the ambient light/sun load sensor or one of the vent temperature sensors go bad and cause this problem to find out which one is bad we need to do a CAN scan, this will tell us which sensor has gone out, you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is one for about $99.00 if you need it:

https://amzn.to/3ZixY4v

Here are the A/C wiring diagrams so you can see how the system works and what parts are involved with the system. Check out the images (below). Please let us know what happens.

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Thursday, August 3rd, 2023 AT 3:58 PM

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