Auxiliary Blower Speeds

When the OFF temperature setting is selected, the auxiliary air temperature switch creates an open circuit within the heater auxiliary blower motor switch. This prevents any output being provided to the heater auxiliary blower motor. When the Low, Med, or High temperature setting is selected, the heater auxiliary blower motor switch applies a voltage to the auxiliary coolant bypass valve solenoid As the auxiliary coolant bypass valve solenoid is energized, a vacuum valve is opened and allows warm coolant to flow into the rear heater core, Each Low, Med, or High temperature setting causes a corresponding Low, Med, or High blower motor setting to be selected. The heater core heats the recirculated air that passes by the heater core. Thus the vehicle's rear temperature is directly related to the amount of air that the heater blower motor recirculates.