2003 Chevy Astro air flow stuck on defrost

Tiny
CHUCKLE101
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
No matter where the selector is set, it seems like the majority of the air is coming out the defroster. This happened one time before and a dealer fixed it.
Sunday, July 6th, 2008 AT 10:07 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check for vacuum at the control head, if none, open the hood, locate the black supply line it runs off the manifold, to a check valve, to a reservoir cannister, and into the van. This line, check valve or cannister is leaking vacuum, or the actuator that controls the air distribution is leaking vacuum.
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Sunday, July 6th, 2008 AT 10:17 AM

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