2006 Chevy Silverado flow control

2006 CHEVROLET SILVERADO
90,000 MILES • V8 • 2WD • AUTOMATIC
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HEAD2004
heat only blows out the floor how do fix it to come out defrost/bi-level
Dec 7, 2009 at 1:35 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,193 POSTS
  • ASE Certified Mechanic
The vents are actuated by engine vacuum. Therefore, you need to check for a leak. Start under the dash and the hood. With the engine running, you may get lucky and hear a hissing.

That is where I would start.

Let me know what you find.
Dec 7, 2009 at 1:44 PM
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