Question about 2002 Chevrolet Silverado 2500HD

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A/C heater vents will only blow out the defrost ducts.

Changed batteries on my 04 2500 HD diesel pickup now the A/C Heater will only blow out the defrost ducts cant switch to cabin or floor. I disconnected the batteries again thinking it was a programing problem but still does not work. Temperture control on both sides still works correctly.

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  • strutton Nov 27, 2008

    me too

  • Anonymous Feb 01, 2009

    03 1500hd silversado 6.0l

  • Anonymous Feb 02, 2009

    i have a 2004 silverado and changed my battery then the heat just blows at my feet and i can`t change it....



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Some times you can "reset" the computer for that by disconnecting the battery for 15 or 20 seconds then re-connecting it. If that doesn't work then the mode door motor assy might have stripped gears or broken gears. (they are plastic) If you are familiar with where the mode door motor assy is you can turn the knob to change the mode (i.e. defrost, panel, floor) and see if the motor is turning. If motor is turning and mode does not change then the plastic pieces have broke or stripped. Usually when there is a problem with the climate control system it will default to the defrost simply as a safety thing. So you will have defrost so you can see where you are going. Hope this helps you all out, good luck.

Posted on Feb 17, 2009

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SOURCE: Changed batteries on my 04 2500 HD diesel pickup

if the heater vent door is not stuck then there should be a resetcombo with the buttons.

Posted on Oct 26, 2009

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