Thermal Limiter

The thermal limiter is part of the blower motor resistor. If airflow through the system is reduced or stopped (due to a locked blower motor wheel, etc.), the blower motor resistor may overheat, damaging the heater housing. If the temperature of the blower motor resistor increases to about 250°F (121°C), the thermal limiter opens the blower motor circuit. The thermal limiter cannot be serviced separate from the blower motor resistor.