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No Heat

Tiny
PAT4752
  • MEMBER
  • 2005 GMC YUKON
  • V8
  • AWD
  • AUTOMATIC
  • 50,000 MILES
Hi,

My 2005 Yukon is not blowing warm air when in the heat mode. It will blow exceptionally cold air when in the air conditioning mode. ANy ideas what to check first?
Monday, October 6th, 2008 AT 12:32 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try replacing the thermostat for a start-don't work you could be dealing with a malfunctioning air mix/blend/mode/ doors to include an actuator/vacuum problems.
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Friday, October 10th, 2008 AT 4:11 PM
Tiny
MDE012001
  • MEMBER
  • 1 POST
  • 2003 GMC YUKON
  • 150,000 MILES
No matter what setting it is on it blows cold air when the heat is on. I think it is doing the same in summer with a/c on just harder to feel. Iwas told it was the air mixer controller but not sure where that is on this model. Tried to locate it behind radio and lost all power to truck. So now I am thinking it is some kind of short maybe. Any ideas or help will be greatly welcome!
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Monday, April 29th, 2019 AT 7:57 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your actuators to see if they are getting power and working generic pic below and a guide to help walk you through the repair.

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (Below). Please let us know what happens.
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Monday, April 29th, 2019 AT 7:57 PM (Merged)

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