How does a blower motor resistor pack work?
How does a blower motor resistor pack work? The way the resistor pack does this is by shortening or lengthening the circuit through the coils to add or subtract the amount of resistance it takes to get the speed you want. So naturally, three speeds, four pins. What happens when a heater motor resistor fails? If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to...