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Why does the ac blow through the defrost but not the vents

(1993 Chevrolet G Series Van (G20))
in Four Oaks, NC on June 08, 2013
it happens every time i cut the ac on.
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Popular Answer
on June 08, 2013
Vacuum leak under hood passenger side small black hose near firewall. Also black vacuum amplifier ball may be defective!
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