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It could be the motor, the fuse, it could also be the resistor pack that gives you the multiple speeds when you switch the fan. Do none of the speeds for the blower work?
if your fan (blower motor) stopped working, more likely is the blower motor resistor, is locate it close to the blower motor. if the blower motor is ok, maybe your heater core is cloged.
check the blower motor fuse, then you can turn truck on put the speed control to high. if fuse is blown replace fuse, if the speed control only works on high, the blower motor resistor needs replacing. It is on passenger side under glove box in close proximity to the blower motor. The fuse is under the hood on driver side. the cover should say fuses/relay on the top of cover, on most ford vehicles you will need to look in the owners manual for the position of the fuse.
Yes I would go with the switch, BUT, does it have a resistor bank? That is, how does it reduce the speed? Many systems use resistors to lower the speed. Burnt or bad connections can cause this as well.
You can test the blower motor by connecting direct power from a source like the cigarette lighter if you are handy.
Most of the time the lower speeds konk out but the high speed continues to work this is the resistor bank that goes out.
It could be your blower switch, but more than likely it's a resistor that is usually a part of the blower assembly, and it operates the speeds. Doesn't cost much but can be tricky installing. If you had one or two speeds not working, initially, eventually all may stop. If fan stopped working and all speeds had been operating, then you may have a bad wire or blower motor. Also, check your manual for fuses, as there may be a compartment inside the vehicle as well as one under the hood.
Check for a blown heater motor supply fuse,
Check operation of heater motor control relay,
Check operation of fan speed control switch,
Check heater motor speed control resistor pack (usually located in the heater ducting - in the air flow),
Check the heater motor runs if power directly applied to the motor- if not motor may be faulty.
coolant flows thru heater core all the time temp is controlled by doors.you have a blockage in core,try removing hoses and backflushing heater core probably a little bit of scale stopping inlet.the fan speed is probably the blower resistor it is locateed next to blower motor under dash check the plug they burn up
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