Rear A/C unit works intermittently?

2005 CHEVROLET TAHOE
190,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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NIVLEM
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
Nov 5, 2022 at 1:04 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,193 POSTS
  • ASE Certified Mechanic
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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Nov 6, 2022 at 7:55 PM
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