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A/C front vents are not working

Tiny
NAYELI SANCHEZ
  • MEMBER
  • 2007 GMC YUKON
  • 6.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
So I turn my A/C all the way up and as cold has it gets, but no air comes out of the front vents. The back row vents are working, but it's only hot air. What could be the problem? Please help.
Tuesday, October 20th, 2020 AT 1:47 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sounds like you have two issues. You could have an air door issue with the rear system and a front blower motor issue. Or you could have a freon/compressor issue and a blower motor in the front.

The fact that air does not come out of the front is where we should start. Let's check the operation of the blower motor by checking voltage at the blower motor.

You should have 12 volts on pin A and ground on B. If you do not then we need to go back in the system to see where we are losing it. If you do then the motor is the issue. Let me know what you find and we can go from there. If the blower starts working, does the front blow cold?
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Tuesday, October 20th, 2020 AT 6:40 PM

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