Or if possibly it may be a recall item.
2001 ford f150 heater fan only works on high.
Any obstructions or hindrances can blow the resistor quickly.
This happens very often to ford pickup truck or suv.
You should check and make sure the blower motor is working properly not jammed or any obstructions preventing the free movement of the blade fins.
Dude the reason the fan only works on high is because the resistor is bad.
Just wondering if it s covered by warranty or not.
Call the ford dealer get the part like 10.
Heat still works only on high setting.
If your 1997 2003 ford f 150 a c heater fan only blows on high or doesn t blow at the lower speeds you most likely have a failed blower motor resistor.
You won t likely find it by looking at the system wiring just know that it is a flat plastic piece mounted by a screw or two i believe with the plug into it.
Just can t regulate the fan it is always on high.
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It mounts under the dash on the firewall on the passenger side.
The only way to regulate it is to shut it off or turn it on.
All you need to do is to replace the resistor ford part number.