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No air through the dash vents in 93 chevy van 20...okay in the back and defrost

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You might have a vacuum line is broken going to the a/c box when this happen the system go to default and blow air through the defrost only

Posted on Jul 22, 2009

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Which vents, floor--defrost--dash? Can you hear the blower motor running? The squirrel cage could have broken loose from blower motor? There could be an actuator problem under the dash? If actuators are vacuum controlled and vacuum is lost, it might default to defrost, only blow out defrost vents.

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