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Front heater only blowing cold air and no change in mode for vents

Tiny
KBALL318
  • MEMBER
  • 2010 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 136,500 MILES
With the heater on full blast set to 90 degrees, I am only getting cold air out of the front vents. When selecting where you want the air to come from defrost, front, and flow. There is no switching between them. The rear heat blows hot air. I think it is my blended air control actuator, but I also know there are two more, one for the modes, one for the temperature and one to blend the air from each side. I just do not know which one could be the culprit.
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Tuesday, September 25th, 2018 AT 3:32 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Yes, it sounds like the blend door has failed. It is odd that the mode door has failed as well but I will post the information.

Roy
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Tuesday, September 25th, 2018 AT 3:40 PM
Tiny
KBALL318
  • MEMBER
  • 4 POSTS
Thank you Roy for the quick response, I will take a look tomorrow morning when I get off of work.
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Tuesday, September 25th, 2018 AT 5:05 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Sounds like a plan.

Keep us updated.

Roy
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Tuesday, September 25th, 2018 AT 5:13 PM
Tiny
KBALL318
  • MEMBER
  • 4 POSTS
It turns out, the fuse was blown.
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Saturday, September 29th, 2018 AT 8:04 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is even better. A simple repair.

Remember, fuses blow for a reason. It will blow again. Make sure you check the components for good clean tight connections.

Roy
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Sunday, September 30th, 2018 AT 4:30 AM
Tiny
KBALL318
  • MEMBER
  • 4 POSTS
Will do and it was the HVAC IGN fuse that had blown.
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Sunday, September 30th, 2018 AT 7:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is the one that feeds the control head. Make sure the connection at the control head is clean and tight.

Roy
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Sunday, September 30th, 2018 AT 7:04 AM

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