Heater/AC switch will not run on 1, 2 or 3?

Tiny
RAHLO18
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 173,000 MILES
The control switch only runs on 4 & 5. Will not run on 1, 2 or 3?
Wednesday, September 2nd, 2015 AT 5:18 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Most likely a bad blower motor resister. Check that first. Here is the location you should look for burn mark or signs of overheating on the resistor. If the resistor is okay I would replace the switch. Check out the images (below). Please let us know what happens.
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Wednesday, September 2nd, 2015 AT 7:20 PM

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