Air flow under dashboard

Discussion in 'General Chevy & GM Tech Questions' started by SilveradoGirl, Nov 18, 2008.

  1. SilveradoGirl

    SilveradoGirl New Member

    I have an '03 Silverado 2500 HD, and while driving it the last couple of winters I have noticed a strong cold air draft flowing in from the gap a few inches below the glove box. The cold air flows in the same no matter if the heat is on or off. I'm hoping for suggestions about the cause and/or a way to fix it?
    Thanks so much.
  2. raisor87

    raisor87 Rockstar 100 Posts

    check the firewall to see if you can find any holes or loose grommets
  3. CoolBlueSS

    CoolBlueSS Rockstar

    Maybe a blend door actuator not closing all the way letting fresh air in.
  4. JMoney02

    JMoney02 Epic Member 5+ Years 500 Posts

    Appears CoolBlueSS is correct, get under the dash, remove the panel cover and have someone operate the controls for Heat/AC, blend door is being held up by something, seal around opening may have come off or deteriorated(should'nt of, not that old) but could have. Most likely the door by the passenger kick panel....

  5. SilveradoGirl

    SilveradoGirl New Member

    Thank for the help. Is the blend door up in the part with the blower motor and blower motor resistor? this unit looks hard to remove.
  6. JMoney02

    JMoney02 Epic Member 5+ Years 500 Posts

    Yes, what about the others when you activate the controls do they function correctly?

  7. daddytech

    daddytech Epic Member 5+ Years 500 Posts

    I would check for lose grommets on the firewall and then check your door seals. If your heat is coming out of the vent holes on the floor as it is supposed to the seals on one of your door may not be sealing correctly or crimpped and folding over instead of laying flat and the cold air is blowing in the open spots as you are driving down the road. but just to make sure it's not the control box for your heater/ac as the others here have mentioned test it while sitting still and see if you get cold air through the floor vents as well as heat or is it just heat that comes in from those. if you get cold when not moving I would look at the control door in your heat and ac unit if all you get is heat from the vents then check the door seals , make sure they aren't crimpped or rolled over at any point and make sure there is a seal around the entire inner edge of the door jam. the reason I say the entire door jam is because some people are missing the bottom part of the door seal and assume that it's supposed to be that way when it's not. That seal is just stuck to the painted metal with adhesive and is one of the first things that gets knocked or broken off of a truck which allows cold air to just roll in the bottom of the door as you roll down the road.
  8. Chevy Girl

    Chevy Girl Rockstar GMTC Chick 100 Posts

    Just checking, did you get resolution to this issue?
  9. stephan

    stephan Rockstar 4 Years 5000 Posts

    Your air leak is right in the area where the heater hoses & AC hoses come through the firewall. Pop the hood & have a look on the outside of the firewall (easier to look there) & see if all the hose grommets are still there & sealing.

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