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If the low and medium speeds of your fan are not working and only the high speed is working, then it is probably the resistor fan control module. This unit will have to be replaced. It is generally located underneath the dashboard on the passenger side. Locate the blower motor and trace back the two power leads from the blower motor. They will terminate at the resistor module. The resistor module is a series of resistors that controls the amount of current flowing into the fan motor. On low speed settings, the current flows though all the resistors and as you increase the fan speed, resistors are switched out until eventually at the highest setting the complete resistor network is switched out. That is why you end up with only high blower fan speeds when the resistor module becomes defective.

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Q: 2001 buick century blower fan stopped working have checked fuses they are okay?
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