No heater/AC blower power?

Tiny
OUTDOORSWITHBOB
  • MEMBER
  • 2010 GMC SAVANA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
I changed the following:
Control panel
fuses
resisters
modules
controls light up
blower fan will not turn on
I forgot to mention:
I have power in the red wire going to the module but no power coming out on the red wire going to the heater motor.
Friday, July 7th, 2023 AT 11:24 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
I would check the ground # G102. here is a guide to help and the blower motor wiring diagrams so you can see how the system works, this guide may help as well. It shows how to check the ground.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Please let us know how it goes.
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Friday, July 7th, 2023 AT 5:26 PM

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