1999 Chevy S-10

1999 CHEVROLET S-10
135,000 MILES • 4 CYL • 2WD • MANUAL
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#1
  • MEMBER
  • 1 POST
air blows thru dash vents only . will not blow thru defrost or floor vents
Oct 25, 2009 at 9:05 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
You are looking for a vacuum leak. The vent doors are actuated by vacuum. Check under the dash and the hood for leaks. Many times, you will hear a hissing sound where it is leaking from.

Let me know what you find.
Nov 12, 2009 at 5:48 AM
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