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2004 trailbrazer heater blower only works on high setting

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Your blower resister is bad. Remove it and check to see if it any burned spots. If you resister is bad either A, your pulling to many amps, or B your blower motor is bad also.
You should be able to check your blower motor by hooking red, 12 volt hot tp connector, and black to frame ground.

Posted on Feb 01, 2010

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