1996 Chevy Astro Ventilation seems stuck on defrost.

1996 CHEVROLET ASTRO
138,000 MILES • 6 CYL • 2WD • AUTOMATIC
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The air on my van will only blow through the defrost vents on top of the dash. The a/c works but only blows through the defrost vents. Its like there is a damper or diverter gate that is stuck sending the air only to the defrost vents. Does anyone know how to repair this?
Sep 18, 2008 at 5:05 PM
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MERLIN2021
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You have a vacuum leak in the supply line from the reserve tank. Or the tank leaks. Look at #'s 2 & 3...


https://www.2carpros.com/forum/automotive_pictures/62217_vac_1.jpg

Sep 18, 2008 at 5:23 PM
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Merlin, you were right. I found a vacuum line broken in two. I repaired it and now I have air coming through my dash vents. Thanks for the tip. You are a real gem.
Sep 18, 2008 at 6:15 PM
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MERLIN2021
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Glad to help!
Sep 19, 2008 at 2:27 PM