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Some vehicles have sensors that can control the electric fan with the ignition off to keep the heat buildup that naturally occurs right after turning off the engine.
This can prevent hard starting that can happen with a hot engine.
If it is doing this an abnormal amount, the sensor that is operable with the ignition off may be failing.
Before turning off the ignition, check to see if the engine temperature is pushing the 'red zone;' if it is, then the fan operation may be normal but your engine may be running hot.
Usually after driving, your rad fan can continue to run for up to 2 minutes after shutting off the car. It can even start up on it's own if it detects that the temperature of the engine is too hot (say if it's over 50 degrees celcius). The fan running for these several minutes should be of no concern. If it's staying on and not turning off for 30 minutes, then that is of concern
Check under the hood and see if you have a decal that says fan may turn on after car is turned off. The fan can run for 10-15min after shut-off. If it's on for only that length of time and it's killing your battery, you may need a new battery. If it's not turning off at all, open fuse compartment under the hood, take a small rubber mallet and start to tap the relays. There should be one there for the cooling fan. Once you find it, (the fan will turn off when it's tapped) you can exchange the relay for another (of the same part number - like the wiper relay or A/C relay or something) restart car, let it run til hot, and turn off. If fan shuts off within 10-15 minutes, you need a new relay.