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1993 Chevrolet G Series Van (G20) Question: why does the ac blow through the defrost but not the vents

 

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meloutlaw, 4.3L V6, Four Oaks, NC, June 08, 2013, 12:20
 Rookie

it happens every time i cut the ac on.

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  • Answer #1

    June 08, 2013, 13:50
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     Master

    Vacuum leak under hood passenger side small black hose near firewall. Also black vacuum amplifier ball may be defective!

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