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Rear heat not working

Tiny
RLS8836
  • MEMBER
  • 2016 GMC ACADIA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
The front heating works fine. It has separate controls for rear heat and it will not get hot.
Thursday, February 6th, 2020 AT 8:36 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

It sounds like the blend door actuator. I attached the procedure and a picture.

This is a common failure.

I would suggest replacing it.

Roy
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Thursday, February 6th, 2020 AT 9:59 AM
Tiny
RLS8836
  • MEMBER
  • 5 POSTS
Thank you for replying. We changed the battery about 4 weeks ago also. But this is the only thing not working as it should. Wonder if they are associated?
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Thursday, February 6th, 2020 AT 10:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I doubt it very much. I would open the panel and command heat and cold and see if it moves the door back and forth.

Roy
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Thursday, February 6th, 2020 AT 11:57 AM
Tiny
RLS8836
  • MEMBER
  • 5 POSTS
Thanks for your reply, I’ve priced them for $17.00 to $37.00. Any particular brand you recommend? I’ve seen Dorman and Murray. Is the re-calibration necessary?
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Thursday, February 6th, 2020 AT 12:02 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Dorman is good.

Procedure attached.

Roy
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Thursday, February 6th, 2020 AT 12:06 PM
Tiny
RLS8836
  • MEMBER
  • 5 POSTS
Yes it was, can I install it and not have to do the recalibration?
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Thursday, February 6th, 2020 AT 2:51 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, it will not work correctly. It must be calibrated for it to work properly.

Roy
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Thursday, February 6th, 2020 AT 3:04 PM
Tiny
RLS8836
  • MEMBER
  • 5 POSTS
Okay, thanks.
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Thursday, February 6th, 2020 AT 3:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Thursday, February 6th, 2020 AT 5:14 PM

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