Air vents stay in defrost position

Tiny
PKIMMEL
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 130,000 MILES
What is the problem? Vacuum or Blend motor?
Thursday, May 24th, 2012 AT 9:58 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,797 POSTS
If your doors are operated by vacuum, they are normally spring-loaded to go to the defrost position when there's a leak or other failure of the vacuum supply. That's done for safety. Your feet might freeze but the windshield will be clear. Look for a small hard plastic vacuum hose under the hood. Be sure it's connected to the intake manifold and not cracked. There should be a small check valve too. You might have to temporarily bypass it to see if it's plugged or stuck.
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Thursday, May 24th, 2012 AT 10:06 PM

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