2005 Chevy Express All air comes out defrost vent

2005 CHEVROLET EXPRESS
76,000 MILES • V8 • 2WD • AUTOMATIC
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GUSTINGANG9
  • MEMBER
  • 1 POST
No matter what setting we put air on (defrost, vent floor), all air comes out defrost vents. There is also a small air hissing sound inside van.
Mar 8, 2009 at 8:42 AM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
Find the hiss, that will be a vacuum leak, plug that hose back in, or replace the leaky controller, and it will be fixed, vac leaks make the system defualt to defrost registers.
Mar 8, 2009 at 9:03 AM
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