Climate Control System (System Airflow Description)

SYSTEM AIRFLOW

AUTO
When AUTO is selected:
- the temperature control setting(s) are manually set to the desired setting(s).
- the air inlet door actuator is automatically controlled by the EATC module, based on the temperature setting(s), but can be manually overridden by selecting the recirculation button.
- the panel/defrost and floor door actuators are automatically controlled by the EATC module based on the temperature setting(s), but can be manually overridden by selecting any of the air distribution buttons.
- the A/C compressor is automatically controlled by the EATC module based on the temperature setting(s), but can be manually overridden by selecting the A/C button. The A/C compressor will not operate if the outside temperature is lower than approximately 2°C (35°F).
- the blower motor is on. The blower motor speed is automatically controlled by the EATC module based on the temperature setting(s), but can be manually overridden by adjusting the blower speed rocker button.

OFF
When OFF is selected:
- the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment.
- the floor door actuator positions the floor door in the open position, the panel/defrost door actuator positions the panel/defrost door in the panel position.
- the blower motor and A/C compressor are OFF.

PANEL
When PANEL is selected:
- the Recirc request button is enabled. If the Recirc request button is selected (indicator ON), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator OFF), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- the floor door actuator positions the floor door in the closed position, and the panel/defrost door actuator positions the panel/defrost door to direct airflow to the instrument panel A/C registers. The system will allow some airflow through the floor ducts.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when the A/C compressor operation has been selected by pressing the A/C request switch (indicator ON) can the airflow temperature be cooled below that of the ambient (outside) air temperature.
- the A/C request button is enabled. When the A/C request button is selected (indicator ON), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator OFF), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
- the blower motor is ON.

PANEL/FLOOR
When PANEL/FLOOR is selected:
- the Recirc request button is enabled. If the Recirc request button is selected (indicator ON), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator OFF), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- the floor door actuator positions the floor door in the partially open position to direct partial airflow to the floor duct, and the panel/defrost door actuator positions the panel/defrost door to direct airflow to the instrument panel A/C registers.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when the A/C compressor operation has been selected by pressing the A/C request switch (indicator ON) can the airflow temperature be cooled below that of the ambient (outside) air temperature.
- the A/C request button is enabled. When the A/C request button is selected (indicator ON), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator OFF), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
- the blower motor is ON.

FLOOR
When FLOOR is selected:
- the Recirc request button is enabled. If the Recirc request button is selected (indicator ON), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator OFF), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment. The EATC will automatically revert to the outside air position after approximately 4 minutes to prevent window fogging.
- the floor door actuator positions the floor door in the open position, and the panel/defrost door actuator positions the panel/defrost door in the defrost position. A small amount of airflow from the defrost ducts and demisters will be present.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when the A/C compressor operation has been selected by pressing the A/C request switch (indicator ON) can the airflow temperature be cooled below that of the ambient (outside) air temperature.
- the A/C request button is enabled. When the A/C request button is selected (indicator ON), the A/C compressor will operate if the outside air temperature is above approximately 2°C (35°F). When the A/C request button is not selected (indicator OFF), the A/C compressor will not operate and the air cannot be cooled below the outside temperature.
- the blower motor is ON.

FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- the Recirc request button is enabled. If the Recirc request button is selected (indicator ON), the air inlet door actuator positions the air inlet door to close off outside air from entering the passenger compartment. If the Recirc request button is not selected (indicator OFF), the air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment. The EATC will automatically revert to the outside air position after approximately 4 minutes to prevent window fogging.
- the floor door actuator positions the floor door in the partially open position to direct partial airflow to the floor duct, and the panel/defrost door actuator positions the panel/defrost door to direct airflow to the defrost duct and side window demisters.
- temperature control can be adjusted by directing the airflow through and around the heater core.
- the A/C request button is disabled.
- the A/C compressor will operate automatically if the outside temperature is above 2°C (35°F).
- the blower motor is ON.

DEFROST
When DEFROST is selected:
- the Recirc request button is disabled. The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- the floor door actuator positions the floor door in the closed position, and the panel/defrost door actuator positions the panel/defrost door to direct airflow to the defrost duct and side window demisters.
- temperature control can be adjusted by directing the airflow through and around the heater core.
- the A/C request button is disabled.
- the A/C compressor will operate automatically if the outside temperature is above 2°C (35°F).
- the blower motor is ON.