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It is located on the passenger side behind the glove box. If you remove the kick plate at the bottom of the underside of the glove box and look up you will see the module with the wire going to it. They are conected to the blower motor and you can trace them back. I you drop the glove box out of the way by slide the keeper to the side you can get to the wires to inplug them from the blower motor.

This and more info is available with pictures of how to do this change (easy) is available at our enthusiasts website:

www.trailvoy.com

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Q: Where is a blower motor resistor on a 03 trailblazer?
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