Question about 1998 GMC Jimmy

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With all controls off it blows hot air even on the coldest setting

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  • lbateman24 Jun 14, 2009

    the blend door actuator works but still blows hot air, does not switch door back and forth
    Has freon and the compressor does cycle

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  • 57 Answers

Try this relearn procedure.

turn key on engine not running
set controlls to: vent, tempature cold, fan on low
turn key off
disconnect battery
wait 30 seconds
reconnect battery
turn key on do not start engine
wait 90 seconds while system recalibrates
turn key off
now start the engine and recheck for a/c operation

if this dosent fix the tempature controll than you will need to replace the blend door motor
and it is behind the glove box, it is black and has one plug on it. if you have to replace it make sure
you go through the relearn procedure afterwards.

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

  • WESLEY SCHACHT Jun 14, 2009

    if the blend door motor cycles full left and full right with no tempature change then the hvac box is damaged internally and must be removed for internal repair

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