Rear heat not working

2008 GMC ACADIA
130,000 MILES • V6 • 2WD • AUTOMATIC
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JUDY LIESCH KIPPLEY
  • MEMBER
  • 1 POST
My rear blower works but it is not blowing heat. Front heat works just fine.
Dec 5, 2019 at 10:37 AM
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DANNY L
  • ✓ASE Certified Mechanic
  • 5,648 POSTS
  • ASE Certified Mechanic
Hello, I'm Danny.

It sounds like you are having an issue with the rear auxiliary HVAC unit blend door actuator.It is a small electric motor that diverts air flow through the specific vents. Here is a tutorial showing what is involved to replace:

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

I've attached step-by-step picture instructions below on how to replace and its location. I've also include the steps on how to re-calibrate the actuator after replacement.Hope this helps and thanks for using 2CarPros.
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Dec 6, 2019 at 3:12 PM
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