2002 Chevy Silverado Control Knob

2002 CHEVROLET SILVERADO
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DUDLEY73
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  • 1 POST
Heater problem
2002 Chevy Silverado V8 Four Wheel Drive Automatic

My heater contorl will not change air flow to defrost or floor.
Feb 16, 2010 at 9:00 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
I feel that you are looking for a vacuum leak in this case. The vent doors are actuated by vacuum. If there is a leak, they won't switch. Check for leaks under the dash and the hood. WIth the engine running, you may get lucky and hear a hissing sound from the leak.

Let me know what you find.

Joe
Feb 16, 2010 at 9:22 AM
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