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2002 Chevrolet Astro Question: When you turn on the fan for your heat or ac the upper vents (dash board)do not



meglowac, 4.3L V6, Morgantown, WV, November 02, 2011, 19:07

blow out.The box under the dash by the passanger gets loud with the sound of forced air.

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  • Answer #1

    February 05, 2015, 13:30

    You probably have a broken vacuum line to the control head. Vacuum is used to control the vent/defrost damper, and if the line is off it won't move. This could be under the hood, or the connector could be broken on the switch itself.

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