1997 Chevy Silverado Defroster not working

1997 CHEVROLET SILVERADO
312,000 MILES • V8 • 4WD • AUTOMATIC
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WINSKINS
  • MEMBER
  • 1 POST
When I turn the selector dial on the dash to defrost, little to no air comes out of the vents on top. Air was coming out the vent on the bottom toward the floorboard. This was a real problem this morning when we had freezing rain. When I turn the dial, it sounds like the air is being re-directed but its not working. Is there any way I can fix this without having to pay big $$ to have the dash taken apart?
Dec 16, 2008 at 3:20 PM
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BLUELIGHTNIN6
  • ✓Experienced Mechanic
  • 16,542 POSTS
It sounds like you have a vacuum leak in one of the hoses connected to the heater system. Check under hood for any vacuum hose leaks. If not there, you will have to go into dash to check vacuum hoses their.
Dec 16, 2008 at 5:49 PM
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MIKE HALL 2020
  • MEMBER
  • 2 POSTS
I am not a mechanic, but had the same problem with my '95 silverado. The problem was a rod or arm had come disconnected from a lever under the dash at the actuator. The actuator was on the end of the heat/air unit by the gas pedal. I removed the bottom trim panel on the dash to make it easier to get to, but not sure this was necessary. Found the rod was loose from the lever that connects to a door internally that directs the air flow. Just reconnected and has stayed connected so far about four weeks ago.
Dec 17, 2008 at 12:31 AM
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