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Rear A/C unit works intermittently?

Tiny
NIVLEM
  • MEMBER
  • 2005 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Thank you for providing this service. The problem is that the A/C in the rear and ceiling of my SUV a) only runs on the highest setting, 3, and b) it only runs intermittently, coming on when I hit a bump in the road, which seems to dislodge or trigger something. The dash A/C runs well and cold. Thanks again. C
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Saturday, November 5th, 2022 AT 1:04 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

In most cases, a failing blower motor resister will only work on high speed and no other. Is that what is happening? The idea that it turns on and off when you hit bumps sounds like there is a loose connection as well.

I need you to do me a favor. Take a look at the pic below and let me know which one fits your vehicle. I can't believe how many different options were possible on this vehicle. LOL Before I start digging into schematics, I want to make sure I have the correct ones.

Let me know.

Joe

See pic below.
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Sunday, November 6th, 2022 AT 7:55 PM

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