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The blower motor resistor in your Ford F-Series controls the speed of the blower motor. When you adjust the fan speed on the dash, the resistor adjusts the amount of electrical resistance to control the amount of power that is sent to the blower motor. The blower motor and resistor are working almost constantly, so both parts may wear out with time. If the blower motor on your Ford truck only works on certain speeds or if it seems stuck on a single speed, the blower motor resistor might have failed. If your Ford F-Series needs a replacement blower motor resistor or the blower motor, O'Reilly Auto Parts carries these parts and more to help you repair your truck.