I had the same problem with my Town Car. It had a thermal cutout switch on the hot water line coming from the engine to the heater. This switch kept the fan from coming on before the engine got warm. I bypassed the switch by taking both wires off and connecting them because the price of a new switch was totally ridiculous. Now i have complete controle of the fan with the switch on the control.
Climate control blower motor was the fix. The part cost 441 dollars.
All electrical circuits in a vehicle have a fuse or circuit breaker somewhere. There are possibly three in the Taurus AC circuit plus a fan relay, a fan speed control module, and a climate control computer.
You will need to replace the blower motor control unit located inside the blower motor housing, this part is not the same as the part on standard explorers, it is not the same blower motor resistor.
What model? This probably has electronic Climate control,therefore there isn't a Blower resistor. The blower is controlled by a Blower Motor Module...its mounted on the HVAC case under the hood near/next to the blower motor.
If your blower motor is either not turning itself off, or randomly turning itself on with the ignition off (and you have auto climate control), the problem is the blower control module. Located directly behind the blower motor, it takes information from the climate control, and is in charge of turning the blower on/off. To replace the blower control module, remove the splash shield under the passenger side dash (there's 3 plastic retainers hold it in place). The blower control module is located behind the blower motor, and is held in with 3 bolts. The 2 rearmost bolts (by the firewall) only need to be loosened, and the front one removed. The entire unit rotates down and can then be replaced.
Has the car got climate control ?
I have an 89 Delta 88 and if you have Electronic Climate Control there is a control module located just right(passenger side) of center at the firewall. It is in the same location as the blower fan resister assembly on a car with standard a/c controls.
on fire wall engine compartment
The blower "switch" is the knob or lever that you turn or move to adjust the fan speed. Located right on the climate control, next to the temperature setting.
Rheostat is shot. Replace it. No, I don't know where it is. No, I don't know how much it costs.
Defective Blower Motor Resistor Pack.
ALL u have to do is change ur blower limit switch is going bad.