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Q:

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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it happens every time i cut the ac on.
(1) Answer
Vacuum leak under hood passenger side small black hose near firewall. Also black vacuum amplifier ball may be defective!