Rear A/C is not blowing air?

Tiny
LNEWTON
  • MEMBER
  • 2007 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
When I turn the A/C on, I can hear the rear A/C blowing but nothing comes out of the front. Whereas I used to hear the front blowing air now it's silent.
Wednesday, August 17th, 2022 AT 12:54 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

Has the front stopped as well? As far as the rear, if the blower motor is running so you hear it, then there must be an issue with the mode door. The mode door is what determines the air flow direction.

The mode door actuator is located behind the right rear trim panel. To get you the correct information for replacement, I need to know if this vehicle has automatic or manual climate control.

If you are not sure if the rear blower motor is running, check the fuse I highlighted in pic 1. Make sure there is power to and from it as well. Here is a link that you may find helpful:

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

Let me know about the system type.

Take care,

Joe

See pic below.
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Wednesday, August 17th, 2022 AT 9:17 PM
Tiny
LNEWTON
  • MEMBER
  • 2 POSTS
The rear motor is running because I can hear it but the front motor there's nothing coming out.
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Thursday, August 18th, 2022 AT 6:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

I misunderstood. If the front blower motor doesn't work at any speed, first check fuse 73 in the under-hood fuse box. If that is good, we will need to check for power at the blower motor itself.

I attached a portion of the wiring schematic for the HVAC circuits. It is 3 pages long, so I didn't want you to be overwhelmed.

When you check the fuse, it's important to also confirm there is power to it. Here is a link that you may find helpful:

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

If you look at pic 2, it shows the fuse location. Again, this is in the under-hood fuse box.

Let me know what you find.

Take care,

Joe

See pics below.
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Thursday, August 18th, 2022 AT 7:13 PM

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