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HEATER
The blower motor circuitry is turned ON. The fan speed knob adjusts the blower speed.Vacuum is supplied to one side of the heater and A/C BI-LEVEL valve vacuum actuator.The valves are in the following positions:
^ The air inlet valve is in the outside air position.
^ The defrost and A/C valve is in the defrost position.
^ The heater and A/C BI-LEVEL valve is in the heater position.
The following actions occur:
1. The blower pulls outside air into the system.
2. The air is forced out of the floor outlets.
The temperature control circuitry activates so that the air flowing through the system is directed through the heater core. The temperature knob can adjust the discharge temperature.