why no heat coming through vent

1997 CHEVROLET LUMINA
176,000 MILES
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JOE1953
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  • 773 POSTS
but heat blow on the floor
Jan 11, 2012 at 4:52 PM
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DOCFIXIT
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  • 18,828 POSTS
Default mode lost vacuum to select switch. Auto or manual HVAC? dual Zone?
Jan 11, 2012 at 5:53 PM