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

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