I had the same problem and ended up replacing the blower resistor and the blower motor. Although it could be one or the other .. mine was both.
Climate control blower motor was the fix. The part cost 441 dollars.
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.
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.
Climate control the temperature
Yes. But you will also need the climate control, evap canister and the blower. It takes about 16 hours to install.
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.
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.
For the automatic climate control A/C unit: Standing in front of the car, the resistor electronic assembly will be ontop of, and to the left, of the blower motor housing, (Follow the blower motor wires), and also just below the relay rail on the firewall, it has 2 separate electrical connectors and is held in place by three screws.