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Day time driving lights go out when my heater quits working.

2000 pontiac gran prix. My heater fan switch only works on HIGH. If I turn the switch down from HIGH the heater fan quits and the day time driving lights go out also. (A/C button and Rear Defrost button also do not work when this happens). WHERE DO I START??? HELP!!!!

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Posted on Dec 29, 2008

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