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My fan stays on after I shut my engine. This is not so bad since it has been extremely warm lately but sometimes it stays on until my (good) battery dies, which is bad. There is a sensor on the radiator, if I recall correctly, that controls when to shut off the fan when the engine is off but I don't remember the exact name of this sensor. Can I buy a replacement part from an auto zone type parts store?
The fan should shut off about... 2-5 minutes after engine shut off. Not enough run time to kill a good battery. So there might be a problem. Your local auto parts store will not have the switch or the relay, but they can be bought online if needed.