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Answered 2009-04-01 22:03:25
fan selector switches are usually riostats it will not make good contact on other settings and therefor only works on 1 setting change switch byou can pull it and check with meter
Replace the blower resistor. It is under the glove box, behind the blower motor.
My 2001 Grand Prix did the same thing. It used to work nicely on setting 2, and over time had to increase to setting 3, 4 and so on to get the same amount of heat. Eventually was getting no heat at all. Brought it to the garage and they replaced the blower mechanism and all was well.
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