1999 CHEVY S-10

  • Tiny
  • #1
  • 1999 Chevrolet S-10

Heater problem
1999 Chevy S-10 4 cyl Two Wheel Drive Manual 135000 miles

air blows thru dash vents only. Will not blow thru defrost or floor vents

Sunday, October 25th, 2009 AT 4:05 PM

1 Answer

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 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.

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Thursday, November 12th, 2009 AT 1:48 PM

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