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Cooling fan not working

My car is starting to run very hot when it is already warm and running at idle speed-like when it is stopped at a light. I have run it while it was warm, and did not see the radiator fan come on. If I hit the fan motor with a wrench it starts.
Is this indicative of a bad fan motor? Is it likely that the sensor will be bad in addition to the fan?

When you spank something and it works, you spanked the right thing.

Works on Kids too.

Yes, it sounds like a bad fan motor.