Blower Motor Resistor & Thermal Limiter

Blower motor resistor is located on evaporator core case assembly, in engine compartment. 3 resistor elements are mounted on resistor board to provide 4 blower motor speeds. Depending on desired blower motor speed, series resistance is added or by-passed to increase or decrease blower motor speed. An overheating protective device (thermal limiter) will open resistor coil when temperature reaches 250°F (121°C), interrupting blower motor operation in all speeds except HI.