Blower Interlock

Blower interlock circuit - Graph:

Operation
At a coolant temperature below 20°C (68°F), no electric power is supplied to the blower motor. As the temperature rises, the blower motor voltage increase in proportion. Above a coolant temperature of 60°C (140°F), the full blower motor voltage is available (see graph of blower interlock circuit). Blower motor voltage depends on the setting of the airflow selector wheel and the position of the control unit lever.