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The fact that you are having blower motor AND headlight problems points to ignition switch failure. Power to both systems comes from the ignition switch and this is a common Grand Prix problem. Here's the fix: http://www.clubgp.com/newforum/tm.asp?m=20670

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โˆ™ 2008-11-02 22:20:04
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Q: Your 1998 Pontiac grand prix blower motor only works on high have replaced the resistor and switch in dash also when this happens on 1-4 positions the headlites go out?
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