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Vents dont work

Discussion in 'GM Electrical Tech' started by Jake Rupnow, Aug 30, 2012.

  1. Jake Rupnow

    Jake Rupnow New Member

    MYac blows onlt threw the defroster vents and when i switch the knob it doesnt do anything just wondering what could be wrong i have a 04 Silverado
  2. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    Welcome to the club!

    The problem likely that the valve is not moving properly. My question is when u put it on feet does it blow at the feet?
  3. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Could also be the mode door actuator...
  4. Jake Rupnow

    Jake Rupnow New Member

    no it doesent blow on the feet either just the defroster vents
  5. Conlan Rose

    Conlan Rose Active Member 2 Years 1000 Posts

    Well I'd look and see if the blower control motor is actually moving the linkage. do that by having truck on/in accessory position so air blows and play with the directional control and watch if the motor moves the linkage and such.
  6. dobey

    dobey Rockstar 3 Years 100 Posts

    There was a non-recall issue that GM would fix for free even on out-of-warranty cars, where moisture could get in and damage some of the blower control circuitry. Some of the symptoms are similar, so you might want to get it checked out at a dealer. The 04 Silverado I used to have had the issue, and they did the repair for no charge. I don't recall the TSB number though.

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