why do cool air blow vent some time?

1997 CHEVROLET LUMINA
176,000 MILES
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JOE1953
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  • 776 POSTS
when engine is at Idle cool air come through vent but when i press on the gas air stop coming through vent, some time air come through vent and some it don't
Jul 18, 2012 at 5:16 AM
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