System Operation

MAX A/C
When MAX A/C is selected:
- The air inlet duct door is positioned by the EATC module to close off outside air and admit only recirculated air.
- The panel/defrost door is at full vacuum and the floor/panel door is in the no vacuum position, directing airflow to the instrument panel A/C registers.
- The temperature is automatically set for maximum cold (60°F) but may be raised 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 center console and instrument panel A/C registers. There is also some airflow to the A/C side window demisters.
- The A/C compressor will be enabled when MAX A/C is selected.
- The blower motor is on.







VENT
When VENT is selected:
- The air inlet duct door is positioned by the EATC module to block recirculated air and admit outside air. From there, air flows through the system to the center console and instrument panel A/C registers.
- The floor/panel door is in the no vacuum position to block airflow to the heater outlet floor ducts.
- The panel/defrost door is at full vacuum, closing off airflow to the windshield defroster hose nozzles. There is also some airflow 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 positioned by the EATC module to close off outside air and admit only recirculated air.
- The floor/panel door and the panel/defrost door are at no vacuum, closing off the passages to the instrument panel A/C registers and heater outlet floor ducts.
- The blower motor and A/C compressor are off.







PANEL/FLOOR
When PANEL/FLOOR is selected:
- The air inlet duct door is positioned by the EATC module to block the recirculated air and admit outside air.
- The floor/panel door is in the partial vacuum position, allowing airflow to both the heater outlet floor duct, the center console and the instrument panel A/C registers.
- The windshield defroster door is at full vacuum, closing off airflow to the windshield defroster hose nozzle and directing airflow to the instrument panel registers. There is also some airflow to the A/C side window demisters.
- The A/C compressor will be enabled when PANEL/FLOOR is selected.
- The blower motor is on.







FLOOR
When FLOOR is selected:
- The air inlet duct door is positioned by the EATC module to block recirculated air and admit outside air.
- The floor/panel door is in the full vacuum position, directing all airflow to the center console and the heater outlet floor duct.
- The temperature can be adjusted to mix airflowing through and around the heater core to achieve the desired temperature level.
- The panel/defrost door is in the no vacuum position, blocking air circulation to the panel A/C registers.
- The A/C compressor will be disabled when FLOOR is selected.
- The blower motor is on.







FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The air inlet duct door is positioned by the EATC module to block recirculated air and admit outside air.
- The floor/panel door is in the partial vacuum position, allowing airflow to both the heater outlet floor ducts, the center console and the windshield defroster nozzle.
- The panel/defrost door is in the no vacuum position directing airflow to the windshield defroster hose nozzle. There is also some airflow to the A/C side window demisters.
- The A/C compressor will be enabled when FLOOR/DEFROST is selected to dehumidify the air and reduce windshield fogging.
- The blower motor is on.







DEFROST
When DEFROST is selected:
- The air inlet duct door is positioned by the EATC module to block recirculated air and admit outside air.
- Both the panel/defrost door and the floor/panel door are in the no vacuum position so most of the incoming air is directed to the windshield defroster hose nozzle. There is also airflow to the Center console and 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.