If you'be lost the function of your A/C or heat Blower motor or you are replacing the blower motor, it's good preventative maintenance to replace the Blower Motor Resistor at the same time. This resistor is usually the culprit if your A/C or heater fan is malfunctioning. This is the blower motor resistor used on 1982-1993 Mustangs equipped with factory A/C.
***Will NOT fit cars without A/C or with dealer installed A/C.***