Rear blend door

TIMFRAKES5

MEMBER
2007 GMC YUKON
6.0L
V8
4WD
AUTOMATIC
160,000 MILES

I have replaced and calibrated the blend door under the dash, passenger side. Rear HVAC still only blows hot air through the lower vents. Pulled the trim off the quarter panel and do not see any additional blend door actuators on that assembly. Computer controls work fine and adjust fan speed. Cannot get the rear controls to change between A/C and heat, or floor to roof vents. My SUV is a Denali.

5 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny,

Yes, there is a blend actuator located on the rear HVAC unit. I've attached a tutorial showing what is involved for replacement.

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

I've also attached a picture and circled it in red.Hope this helps and thanks for using 2CarPros.
Danny-

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Monday, December 17th, 2018 AT 12:14 AM

TIMFRAKES5

MEMBER
1 POST

In my 09 Denali there is neither blend doors are visible once removing the panel?

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Saturday, June 5th, 2021 AT 2:44 PM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Is this the same vehicle or a different one? Original post is for a 2007. If this is a different vehicle we need you to start a new question including all vehicle information and symptoms. Here is the link to start a new question:

https://www.2carpros.com/questions/new

Once we receive we'll be happy to help. Thanks for using 2CarPros.

Danny-

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Saturday, June 5th, 2021 AT 5:26 PM

GRINDMYGEARS82

MEMBER
1 POST

It's on the side against the wall. These cars came with either delphi or behr rear HVAC boxes. I couldn't find it either until I put my hand on the back side. Take out the 2 upper bolts and that will give you enough room to take it out. It's the lower one more towards the rear of the car.

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Saturday, June 12th, 2021 AT 3:01 PM

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Thanks for adding to the thread. It's always helpful when it might help someone with the same issue and vehicle when their having a similar problem. Thanks again for using 2CarPros and we hope you will use our site again in the future when needed.