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The middle vent will start blowing hot air when the A/C is on?

Tiny
GERONBELL
  • MEMBER
  • 2005 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 155,000 MILES
When l stop and switch it off and start back it will blow cool again. It’s getting to be ongoing. Started about a month ago. I changed the bottom blend door actuator about 6 years ago, I had a similar problem with the side vents going to hot.
Monday, August 8th, 2022 AT 8:40 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This sounds like a problem with the door actuator mode which is common. What happens is the potentiometer going out inside the actuator which causes the operation problem. Here is a generic guide to help you see what you are getting yourself into with the repair with instructions on how to change it out in the images below:

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

Check out the diagrams (below). Please let us know what happens.
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Tuesday, August 9th, 2022 AT 9:16 AM

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