I believe it's a clutch driven fan with a temperature element in the clutch. I've had one go bad and it's a bit ot a pain to replace. You have to take off the fan shroud and disconnect the main radiator hoses to give yourself some space. The Haynes manual has a good description.
SOURCE: Radiator Fan continuously running with engine off, discharging battery
It is not the fault: for long time Renault has that concept, that is to prevent engine oveheating when coolant circulation is suddenly stopped.
Radiator fan can continue to work up to 10 minutes after engine is off. You should worry about it only if it wouldn't stop even after 10 minutes.
SOURCE: 2000 Ford Expedition Overheating
this may be a cluster,wiring or sending unit problem.ask your dealer how hot the engine was getting,with a scanner they can tell what temp the coolant is at.yes your temp gague is rising but is the engine even overheating ?
Did you replace the sensor by the thermostat in the engine block or the one under the drivers headlight, There are two, the one next to the thermostat controls the temp gauge in the vehicle. the one under the headlight assembly controls the actual fans and is a electronic module. You have to remove the head light assembly to get to it.
Joe
SOURCE: cant find drain plug on radiator for 2000 ford expedition
The radiator drain plug is on passenger side of the radiator tank at the bottom. You can use pliers to loosen it. Be careful that it does NOT come out, only loosen it enough to drain the anti freeze.
SOURCE: No heat in my 2000 ford expedition
You should check your blend door, go to the center of your dash look down towards the floor right at the bottom on the hump (tunnel area) you will see a black or same as interior color, cover it has small slits cut in it, it is held in by two expanding type plastic bolts, they do not unscrew, just pull them out, one on each side. Once removed locate the white small box with a wiring harness connected to it, a little to the right hand side. This is the stepping motor that controls the blend door. Remove the stepping motor, and reconnect the harness, look at the motor drive unit and operate the heater control knob, does the motor turn, if it does then use a mirror and look at the drive end of the blend door itself, it is probably broken. If the door is broken, this repair just got difficult, the entire dash will have to be removed to access the environmental station, once accessed there are about 10 screws that hold the top cover on the enviromental station, undo these screws and remove the top cover, then you can remove and replace the blend door. If you are not comfortable with this difficultly level in repair I suggest you seek out your favorite local shop. removing the dash is not easy, there are alot of screws, some in very difficult places to reach. Testing the motor is easy. I hope this helps, let me know.
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