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Heater/AC will not turn on

Tiny
RSTREB223
  • MEMBER
  • 2003 CHEVROLET AVALANCHE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 84,000 MILES
The heat/AC unit will not even light up when I turn it on, so I am not getting anything. I checked the fuses and replaced them and still nothing.
Monday, March 19th, 2018 AT 2:37 AM

3 Replies

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

Do you have auto climate control?

Do you mean the control head or the AC button that will not light up?

Roy
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Monday, March 19th, 2018 AT 2:50 AM
Tiny
RSTREB223
  • MEMBER
  • 3 POSTS
I think I have auto climate control, and when I press the power button to the heater/AC nothing lights up and nothing turns on.
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Monday, March 19th, 2018 AT 8:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay.

I attached a diagram of the system for you. You need to check the two fuses listed for power on both sides as the unit will not work without power.

One fuse box is at the left end of the cluster and the other one is under the hood.

Roy
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Tuesday, March 20th, 2018 AT 3:28 AM

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