"How do you replace the fan control switch on a 2002 Grand Prix?"
Which fan motor?
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Temperature coolant switch is bad or fan relay is stuck closed. Unplug the temperature switch and see if fan goes off. If not, it is the relay. Unplug relay and check contacts with meter to see if they are close (no resistance). Replace relay or switch depending on results.
Why are you replacing the switch? If the fan works only on high speed, replace the fan resistor. There was a TSB for this.
Yes. Simply turn on the ceiling fan while the light switch is in the "on" position. Adjust the spinning to the level of your choice. Now the fan will turn on and off when you switch the light on and off.
Bad low limit switch,fan switch.
the radiator could still be warm or if the car is cool and it runs you need to replace the fan relay switch.
There is a thermostatic switch that operates the fan. It can run after the engine is shut off. It appears it is stuck in the ON position or there is a short in the harness. Try disconnecting the cable to the fan and see if this isolates the problem. If it is the switch, it should not be too expensive to replace it.
The switch underneath the coolant reservoir may have gone bad overtime. It is simple to replace.
The radiator fan sensor switch or the radiator fan motor are at fault (maybe even both). Wire the fan motor direct to see if it will run, if it does, replace the sensor switch. If the fan motor doesn't run, replace the fan motor before you buy a new sensor. If after replacing the fan motor, the fan still doesn't run, then replace the sensor.