why no heat coming through vent

1997 CHEVROLET LUMINA
176,000 MILES
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JOE1953
  • MEMBER
  • 809 POSTS
but heat blow on the floor
Jan 11, 2012 at 8:52 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Default mode lost vacuum to select switch. Auto or manual HVAC? dual Zone?
Jan 11, 2012 at 9:53 AM
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