2003 Chevy Astro air flow stuck on defrost

2003 CHEVROLET ASTRO
190,000 MILES • 6 CYL • 2WD • AUTOMATIC
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CHUCKLE101
  • MEMBER
  • 1 POST
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.
Jul 6, 2008 at 10:07 AM
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MERLIN2021
  • CERTIFIED EXPERT
  • 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.
Jul 6, 2008 at 10:17 AM