» » »

Chevrolet Q&A

Ask Your Question

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

 

Question

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

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

1 Answer
Flag This
  • Answer #1

    February 05, 2015, 13:30
     Journeyman

    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.

    Reply
    Flag This