Question about 2003 Chevrolet Cavalier

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Blower won't go to defrost on 2003 cavalier

I have lots of heat on my feet, but it won't go to defrost, knob bounces back. Is it a vacuum line or a cable control? I saw a previous post that claims it a cable control that is bent, and you can straighten it out. Others, have told me it is a vacuum line. Thanks, Lynn

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  • renee90 Feb 02, 2009

    on mine it's a 03 too, but it's stuck blow air out of the vents. When I try to turn it to defrost it pops back.

  • nfn421 Feb 05, 2009

    Same problem. Knob wants to snap back and blow heat through the vents and not the vent for defrost

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This happened to my 2003 cavalier 2 times now both times we had to take it to the dealer they told us that the cabel broke both times works great after they fix it thank god for warenties

Posted on Feb 21, 2009

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3 Answers

Heat and air wont blow through vents


The selection door, is operated by 1/4" vacuum hoses. When turning the knob or sliding a lever, to select between floor, vents, or dash deck for windshield defrost, vacuum is created by the valve body and the blower will then blow thru the desired vents. When these hoses/lines are compromised, especially on a vehicle over 15 years old it seems likely, vacuum won't be created, and the last working position, is normally where it stays! Until the lines are replaced.
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1 Answer

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1 Answer

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