Question about 2002 Chevrolet Silverado 2500HD

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F250 Heater mode selector control will not work. Stuck in the defroster mode.

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  • Chevrolet Master
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The actuator vent unit may have gone bad, you can try reseting it by removing the fuse to the HAVC system under the hood and in the side of the dash. Place the fuse back in after 2 min and hope it will reset the actuator to have it work properly again.
Most likely the plastic gears in the actuators have gone bad and the unit will need to be replaced.
Thank you for using fixya and Auto Zone will have the part you need and the step by step instructions to get the job done with common tools.

Posted on Jun 02, 2010

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Posted on Jan 02, 2017

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vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

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Sounds like the switch behind the selector is eithe broken, or stuck in that posiition (or internally) is not moving. I suggest pulling the heater/ac selector unit out and checking the levers from the back side.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com

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