If you have one fan on the vehicle, the fan speed is controlled by a fan module based on temperature or A/C high side pressure. Some vehicles have 2 relays in the relay black box in the engine compartment. You need to call the dealer and give them your vin number and they can tell you what you have narrowing down your search.
SOURCE: 2002 Ford Taurus blower fan only works on high
fords are notorius for faulty fan switches, you will need to get a new one, but it will probably fail in a year or two.
SOURCE: need to replace thermostat 2000 taurus
If it's the 3.0L Vulcan Engine (OHV), the thermostat is on the driver's side of the vehicle. Follow the upper radiator hose back to a metal area with three 10mm bolts. This is the thermostat housing. Undo the bolts, and there's the thermostat. Mark the back of it with the old thermostat in it (if you get one with a jiggle valve, it'll make it easier to put the new one in because the jiggle valve needs to be on top). The thermostat and housing aren't perfectly round, so you'll have to play with it a little to get it to line up. Make sure to change the gasket. The spring side of the thermostat goes into the engine.
The water pump is in the serpentine assembly. It's the larger pulley located toward the firewall. It'll be easiest to remove the water pump if you also remove the coolant recovery tank. The water pump pulley has four 1/2" bolts that you need to take out WITH THE BELT STILL ATTACHED. I can't stress this enough. The belt will keep the pulley in place so that you can remove the bolts. Take the pulley off, then the belt. Remove the heater hose at the top and the radiator hose at the bottom. There are 12 bolts of two diameters (1/2" and 10mm if I'm not mistaken). Tap the heater hose lightly with a soft-faced mallet to break the seal with the gasket. Trash the old gasket. Replace gasket (you can also line the mating surface of the water pump with RTV Sealant, put the new gasket on the new pump, and line the other side of gasket with a second coat of RTV sealant if you want a really good seal). Install the water pump and torque to manufacturer's specs. Attach the pulley to the water pump hand tight and put the belt back on. Tighten the pulley bolts. Put the coolant recovery tank back in place. Fill with coolant, start engine, bleed and check for leaks.
To bleed cooling system: Idle the engine until the thermostat opens (you'll be able to tell bacause the upper radiator hose will be uber hot and you'll feel coolant running through this hose). Squeeze all hoses in the system that you can reach, but don't burn yourself. Stop the engine and let it cool. Open the radiator cap and squeeze the COLD upper radiator hose. You'll see some bubbles in your recovery tank. You might have to monitor your coolant level for a couple of days while the final bits of air are purged through your radiator cap (that's why it's pressurized).
Hope this helps. It's not hard, but it took me quite awhile.
SOURCE: Radiator cooling fan fuse location for Ford Taurus
The cooling fan on a ford car usually does not have a fuse. The cooling fans are controlled by a relay in the power distribution box inside the engine compartment. The box is usually located near the battery. Your owners manual should have a guide showing you what each relay in the box is for.
SOURCE: 2000 Taurus: Where is the fuse box in my 2000 ford taurus...
The cabin fuse box is located under the dash on the drivers side and the main fuse box is under the hood in the front of the engine above the radiator on the drivers side
Fig. 2: Location of the oil pressure sensor-3.0L DOHC engines
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