assuming your talking about an expedition the blower motor is located behind the glove box/dash board area. If you plan on ripping it open to fix it yourself be sure to unhook your battery and wait 2 minutes before working on it so your air bag doesn't go off lol. (the resister is fixed to the blower motor btw)
The blower resistor has failed.The blower resistor has failed.
The blower motor speed resistor is burned out.
The blower motor speed resistor is burned out. The high speed function bypasses the resistor. The speed resistor is generally located near to the blower motor.
Check the resistor if it only works on high Check the resistor if it only works on high Check the resistor if it only works on high
There is a resistor near the blower that is bad, known cause is high speed only.
blower resistor is bad
More than likely the blower motor speed resistor is burned out.
The blower motor speed resistor is burned out.
That would be caused by the blower resistor.
the resistor for the blower motor is busted blower works on high with out it
Most likely cause is a failed blower resistor.
Resistor on the heater blower motor has failed