Question about 1998 Chevrolet Tahoe

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98 chevy tahoe 4x4 defrost quit working. I get heat for the floor and from vents , but not the windsheild defrost . Please help ronandtheresa@gmail.com

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  • theresa ann Mar 02, 2009

    Thanks so much for a quick reponse..I will try that.

  • donlubben53 Apr 06, 2009

    I have plenty of air movement to floor and and dash vents but none to winshield defroster vents.

  • yadayada
    yadayada May 11, 2010

    check the defrost door operation, u will have to climb under the dash/

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  • Chevrolet Master
  • 6,982 Answers

Check blend door motors under dash on heater box. Move heater control and see which one is not moving. That's the one thats broken or sticking!

Posted on Mar 02, 2009

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Jan 21, 2016 | Cars & Trucks

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Toyota tundra floor heat quit


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Jan 13, 2014 | 2002 Chevrolet Tahoe

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The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

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The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

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1 Answer

My 2007 Tahoe will not blow heat out of floor vent or defroster


Under your dash you have a motor that moves a door that will change the air flow from defrost,to vent ,to the floor mode. This is not functioning properly. I am not real familiar with this late of a model, but you have either a bad bad vacuum switch, bad electric motor or bad controls on your dash.Hope this helps

Please take a moment and rate my answer............Thanks

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My heat only comes out the floor position. it is stuck it won't change to vent, defrost, etc. need help my wife needs clear window so she can see to drive in early cold winter morning with my daughter. ...


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