Heater issues

2007 GMC ENVOY

171,000 MILES • 4.2L • 6 CYL • 4WD • AUTOMATIC

SCOTTY REED

MEMBER
1 POST

Heat blows only on driver side, blows cold on passenger side and back also, I think it is the blend door actuator. It also blows a lot harder on the passenger side too. A/C works good on both sides but still blows harder on passenger side.

Oct 28, 2017 at 10:06 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

You are right! it is the blend door actuator for the passengers side which is the easier of the two to change.

Here is a guide to help you see what you are in for when doing the job.

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

Here is what it will be like on your car which is a little different the right side is the first image and the left side is the next. Then I uploaded the defrost and mode actuators in case anyone else needs them (below).

Please let us know what happens.

Cheers, Ken

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Oct 30, 2017 at 1:47 PM