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it is likely the blower motor went out. It is located under the passenger side dash board. The plug goes bad in them and the new ones are hardwired in. to fix wiring. turn blower on, and see which one lights up this is your power, should be black, the orange or red is the resistor wire that controls fan speed. hard wire these back into new motor and replace. Note: if you get the wiring order wrong the fan wont work properly. replace and you should be good to go with a 8mm nut driver or socket. there are 3 bolts, but it is not easy to access.

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Q: Defroster will not blow in 2003 Pontiac Sunfire?
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