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2001 Chevy Astro selector switch doesn't change air directi

Tiny
RNDYWILLIAMS
  • MEMBER
  • 2001 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
When running the Heater/AC the selector switch will not change the air position. It stays on "Floor/Defrost at all times. It started doing this only at times, now all of the time. It also sounds like one of the "Air Ducts" is plugged up.
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Saturday, December 12th, 2009 AT 9:40 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
In this case, you are looking for a vacuum leak. The vent doors are actuated by engine vacuum. If the vacuum isn't there or is too weak, this is what happens. Check under the dash for leaks and follow the supply line to the engine to make sure it isn't disconnected or damaged.

Let me know what you find.

Joe
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Monday, December 21st, 2009 AT 7:35 AM

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