I have same...Fan Controller on front clip bad, or shorted lower radiator thermo switch, drivers side.
The fans will probably stay on while the defroster is on because the A/C compressor is running.
Yes its in the back of the grill area in front of the radiator
The fans are controlled by a temperature switch, which normally turns the fans on when the engine temp reaches about 212 to 220 degrees.
to dissipate the residual heat in the radiator it will shut off automatically
Thermostat is stuck.. Is the cooling fans coming on at 232 degrees? Is the radiator sludged up?
Blown fuse, defective thermal relay, or bad fan motor.
radiator fans running to cool engine...
There are 2 fans that would be running while you are driving and that is normal... the compressor fan if you have the air conditioner running and the radiator fan runs to help keep the radiator cool while the engine is on.
More than likely the radiator fan resistor has gone bad. It is located at the bottom corner of the radiator.
If the fan that is running is the radiator fan, this is nothing to be concerned with. Some vehicles have fans that will run even if the car is off. The fans run to cool the engine down. If it continues to run, the radiator fluid may need to be replaced. If the fan that is continually running is the heater/air conditioner fan, there is an issue with the switch that turns it on and off, or in the electrical system. This can be checked by a mechanic.
Make sure all cooling fans around radiator and condenser are running with a/c on and engine running at operating temperature. If ok then most likely cause would be low coolant level or restricted( clogged) radiator. My sisters 91 did the same thing two years ago and it took a new radiator to fix it.
The fans normally come on when needed. Is the car running hot -- is the temperature gauge reading above normal? If so, there's a problem with the fans or the cooling system. If not, don't worry about it.