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There is a fan motor resistor board located under the dash on top of the plastic duct housing on the passenger side of the vehicle. It is behind the glove box. Removing the glove box will help you to get to the resistor. The power to the fan motor uses various resistances on that board to get your lower fan speeds, but on the highest setting it bypasses the resistors since they are not needed. You always will get your blower motor to work but only on high only when the resistor board is bad.

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14y ago
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Q: Why will only the high fan work on a 2005 Chevy trailblazer AC Why does only the highest setting on my ac fan on the 2005 Chevy trailblazer?
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