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Could be resistor is burned out Could be low-speed fan relay is not working Could be low speed motor winding is burned out

Probably the resistor. I had same problem. to replace resistor it's under glove box. Pull down carpet under glove box. look toward the front of the car. it's connected to the blower motor wires. held on by one screw.

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Q: Your heat and air in your 2002 grand prix only works on speed 5 1-4 dont work at all how do you fix this?
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