Question about 2002 GMC Sierra

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Air conditioning my 2006 GMC truck 3/4,the air condtioning only blows air out on the floor not the air conditioning vents,any suggestions.

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  • crzynickratk Aug 05, 2008

    I have a 1991 Cadillac Brougham with a 305 in it. It started to switch blowing cold from vents to floor when under a load or acceleration. After reaching no load speed, it reverts back to vents. What is wrong with it?!

  • Anonymous Aug 30, 2008

    air comes out of floor vent only no matter where I turn the control knob

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Check for a broken or loose vacuum hose under the hood also........




Good luck........

Posted on Aug 15, 2008

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The way the vehicle moves the "flap" inside the dash from position to another to allow air to blow is through a vacuum system, check the vacuum line going to the control unit and if htat is not it, check the vacuum lines leading to the actual flap

Posted on Aug 06, 2008

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