Heater Control not working?

Tiny
YOURMAMA1975
  • MEMBER
  • 1999 GMC YUKON
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 126,000 MILES
I just recently had my dash apart for a separate reason. The vehicle listed above is an SLT. I replaced the heater core and heater fan because they were bad. All wires plugged in. The problem is, my blend and heat/cold control knobs, recirculating button and A/C buttons do not work. The fan control does work. It feels like it is blowing about 60° to 70°when on and engine is warm. Could this be the heater control panel itself? I'm getting ready to order one, but I would like an expert's advice because I can always return it if it's something else. Any help would be greatly appreciated. Thank you
Sunday, November 20th, 2022 AT 7:38 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
It could be the HVAC control module, but we should check the G202 ground on the right side of the dash. Also check the fuse #12 for power. here is a guide to help and the climate control wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Also included is how to change out the HVAC controller in case you need it. Check out the images (below). Please let us know what happens.
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Monday, November 21st, 2022 AT 10:14 AM

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