Q: Heater/ac blower resistor

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The fan (blower) sometimes works and sometimes does not work. When I jiggle, the wire cable connection to the resistor, the blower will go on sometimes. Is my problem most likely with the wiring, connection, or the resistor itself? And, how would I find out for sure? Thanks.

My car has 44000 miles.
My car has an automatic transmission.

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