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AnswerDefective heater resistor pack.

Also when you say high do you mean just setting "5" if so than it is simply a fauly/blown fuse it should be in the fuse box in the glove box labeled some thing like "hvac fan" or "hvac low".

had same problem and it was the ignition switch not the resistor

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Q: Why would the heat come on high but not low in a 1998 Grand Prix Se?
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