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There is a thermostat which turns the fan on and off to maintain a reasonably level temperature of the coolant. If the fan has stayed on, I would think that the thermostat has jammed on and that's why it keeps the fan running. You will need a new thermostat. ( Not the water thermostat that is in the engine) A fan thermostat is what you will likely need.. A Dealer or parts outlet shop will know what you need.
it could be a faulty fan relay, however some of these had a continue run time program that allowed the motor to cool off after engine shut down. it shouldn`t run longer than about 2/3 minutes.
Many cars have this feature. The fan will run for a few minutes at a time until the coolant in the radiator drops below a certain temperature. Most vehicles with this feature will have a warning label on the radiator shroud indicating that the fan may start without warning when the engine or radiator is still hot. The only time you would need to be concerned would be if the fan continues to run without turning itself off, and causing the battery to be drained.
This link should be the location where yours is located. When it is working properly, it turns on the fans when the coolant reaches a certain tempeture.. In your case im assuming the switch is defective.. and stuck open.
The fan will occassionally continue to run for five or ten minutes after the vehicle shuts down. This is normal.
What is not normal is if it keeps running until the battery drains.
Does it just keep running? If it eventually shuts off, how long does it take? Did this just start happening? The two days you mentioned, were they short trips, opposed to the third day?
If you would comment me back with some more details, it would help me help you.
Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.
If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).
If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.
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