Q: My car fan runs on 2 speeds - can I replace the radiator fan resistor?

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At times radiator fan will come on high and then go to a lower speed or vice versa and will continue to run on high even after the car is turned off for a few minutes. But if I turn off the car when fan is running on low speed it will turn off with the ignition.

My car has 130000 miles.
My car has an automatic transmission.

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