The blower resister could be bad, or the blower switch could be failing. Check the resister first, it is commonly mounted at the rear of the blower housing under the hood.
The switch had a meltdown or the high speed relay is stuck.
cause its a ford and there pieces of s**t
You will only have high speed fan
I'm not a mechanic, but I do believe if you bypass the resister you will only have high speed on the fan. To that end, if the resister is your problem you should already have only high speed on the fan.
Sounds like the fan switch is fried. If it is stuck on high speed the blower relay may also be fried.
The blower motor resistor is bad and goes to high fan.
i have a problem with the automatic climate control the fan has only high speed
Light dimmer switch is okay for ceiling fan.
same as low speed relay its call fan mode
This fan has three speed settings, low, medium and high.
Resistor on the heater blower motor has failed
Could be a bad fan motor resistor