AC/heat not blowing using fan speed control

Tiny
JULES4TY
  • MEMBER
  • 2009 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
The front AC/heat fan speed controls on my SUV (with automatic controls) do not work/operate.

I can feel some air coming out, but the speed will not change up or down.

The rear temperature and fan speed both work, just not in the front.

I have read about problems with the blend door actuators, but how do I know which one may be bad and needs changing?

I have checked fuses and fuse blocks. Also did the reset procedure of removing the battery terminal for five minutes and starting the truck without touching controls for at least one minute. Nothing has worked thus far.
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Friday, July 5th, 2019 AT 6:35 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

If all fuses are good, I suspect either the fan motor has failed or the blower motor module (resister) has failed.

I am going to provide directions for replacement of the module. You need to access it and determine if there is power to the connector. Do this and let me know what you find.

__________________________

See Picture 1 and picture 2 for the directions.

Take care,
Joe
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Friday, July 5th, 2019 AT 7:23 PM

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