Blower Motor Resistor: Description and Operation

Blower Motor Resistor Coils:

Blower Motor Thermal Limiter:

The heater blower motor switch resistor has the following features:
^ The assembly is located on the evaporator core housing in the engine compartment.
^ Three resistance elements are mounted on the resistor board to provide four A/C blower motor speeds.
^ Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
^ An overheating protective device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except HI.
^ The thermal limiter cannot be reset and is not repairable.