Question about 2004 Chevrolet TrailBlazer

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HOW DO I FIX THE AC/HEATER BLOWER FAN ON MY 2004 CHEVY TRAILBLAZER. IT ONLY WORKS ON THE HIGHEST TWO SPEEDS 4 AND 5

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  • yadayada
    yadayada May 11, 2010

    replace the blower motor swtich and the connector to it.

  • Anonymous Mar 24, 2014

    fan speed switch not working on 4 and 5

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2 Answers

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  • Chevrolet Master
  • 443 Answers

Your switch acts as a reastat which adjusts your speeds your switch is going bad so you only have the two speeds left on that reastat.. thanks Jerry

Posted on Apr 22, 2009

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  • Chevrolet Master
  • 1,311 Answers

It is not the switch, the problem is likely with the resistor pack and/or the connector to it. Make sure there are no burnt wires or damaged contacts on it.

Posted on Oct 27, 2011

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2004 Chevy Trailblazer the ac/heater blower does not work on low settings


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The heater/ac fan only works on speed settings 4 & 5


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Sep 03, 2009 | 2004 Chevrolet TrailBlazer

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The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
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Passenger side under the dask are 2 cable hook ups. the one on the farthest right (Only 2 wires going to the plug) is the fan power cable. Jiggle it while the fan is on position number3 so you can hear when it comes on!!!

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