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I have a 2000 Chevy Astro that only blows out the defroster vents

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It is a 90% chance the plastic vacuum line to the heater control from the engine has broken.
Remove the air filter housing and the rubber hose from the engine to the air filter housing.
Look for a small black plastic tube coming from the pass side fire wall going back across the engine to the drivers side middle of engine.
Look for a broken section and repair with small rubber tubing.
Once the engine is started.....vacuum is restored to the heater control....and it should work as new.

Posted on Sep 30, 2009

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