Question about 1999 GMC Yukon

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Replaced the blower motor resistor, the air still blows through the defrost vents. Fuses are ok, what should I do next?

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  • 913 Answers

The blower motor resistor is for the speed of the blower not the direction of air flow you need to check the operation of the air flow direction control flaps

Posted on May 27, 2010

  • yukongreytig May 28, 2010

    Thanks for responding Guru... Wher are the air flow direction flaps located?

  • Jim May 29, 2010

    I'm UK based so not familar with GMC but most heaters operate on the same principle, the flaps are inside the heater box, if they operate with cables you will see them at the sides of the heater box attatched to the control levers, so check that they move and operate the levers, if the levers don't move the cable may be broken or adrift from the controls on the dash.
    the heater box can be seen under the dash, you will need to check both sides to look for the levers, you may have to remove part of the lower dash to see them, hope this helps

    Regards


    Jim

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