System Air Flow

MAX A/C
When MAX A/C is selected:
- The air inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.
- The floor/panel door and the floor/defrost door are at the full vacuum position, directing airflow to the A/C register.
- The temperature is usually set for maximum cold but may be heated if desired.
- Air will be picked up at the recirc opening by the blower motor. With the A/C control set for maximum cold, airflow across the A/C evaporator core will be diverted past the heater core and then directed into the passenger compartment through the instrument panel A/C register. There is also some airflow to the AC side window demisters.
- The A/C compressor will be enabled when MAX A/C is selected.
- The blower motor is on.







NORM A/C
When NORM A/C is selected:
- The air inlet duct door is in the no vacuum position, blocking recirculated air and admitting outside air.
- The floor/panel door and the floor/defrost door are at the full vacuum position, directing airflow to the instrument panel A/C registers.
- The temperature may be raised if desired.
- The A/C compressor will be enabled when NORM A/C is selected.
- The blower motor is on.







VENT
When VENT is selected:
- The air inlet duct door, with no vacuum being applied. will block recirculated air and admit outside air. From there, air flows through the system to the instrument panel A/C registers.
- The floor/panel door is in full vacuum position to block airflow to the heater outlet floor duct.
- The floor/defrost door is at full vacuum, closing off airflow to the windshield defroster hose nozzle. There is also some air flow to the A/C side window demisters.
- The temperature can be adjusted to heat the air but air cannot be cooled below outside temperature.
- The A/C compressor will be disabled when VENT is selected.
- The blower motor is on.







OFF
When OFF is selected:
- The A/C inlet duct door is at full vacuum, closing off outside air and admitting only recirculated air.
- The floor/panel door is in the no vacuum position, closing the passage to the instrument panel A/C registers.
- The floor/defrost door is at full vacuum, closing the passages to the windshield defroster hose nozzle.
- The blower motor and the A/C compressor are off.







FLOOR
When FLOOR is selected:
- The air inlet duct door is in the no vacuum position, blocking recirculated air and admitting outside air.
- The floor/panel door is in the no vacuum position, blocking air circulation to the instrument panel A/C registers.
- The floor/defrost door is in the full vacuum position, directing all air flow to the heater outlet floor duct.
- The temperature can be adjusted to mix air flowing through and around the heater core to achieve the desired temperature level.
- The A/C compressor will be disabled when FLOOR is selected.
- The blower motor is on.







MIX
When MIX is selected:
- The air inlet duct door is in the no vacuum position blocking recirculated air and admitting outside air.
- The floor/panel door is in the no vacuum position blocking air circulation to the instrument panel A/C registers.
- The floor/defrost door is in the partial vacuum position, allowing airflow to both the windshield defroster hose nozzle and the heater outlet floor duct. There is also some air flow to the A/C side window demisters.
- The A/C compressor will be enabled when MIX is selected to dehumidify the air and reduce windshield fogging.
- The blower motor is on.







DEFROST
When DEFROST is selected:
- The air inlet door is in the no vacuum position, admitting outside air.
- Both the floor/defrost door and the floor panel door are in the no vacuum position so that most of the incoming air is directed to the windshield defroster hose nozzle. There is also airflow to the A/C side window demisters.
- The temperature setting will determine the amount of air that is directed through the heater core and the amount that bypasses the heater core.
- The A/C compressor will be enabled when DEFROST is selected to dehumidify the air and reduce windshield fogging.
- The blower motor is on.