Climate Control System (System Airflow Description)

SYSTEM AIRFLOW DESCRIPTION - MANUAL CLIMATE CONTROL

Max A/C
When MAX A/C is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air and admitting only recirculated air.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum position, directing airflow to the instrument panel A/C registers.
- The heater control valve (if equipped) is at full vacuum, preventing the flow of hot coolant to the heater core. Blended air temperature is not available.
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. Blended air temperature is not available.

A/C
When A/C is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum position, directing airflow to the instrument panel A/C registers.
- Blended air temperature is available.
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. Blended air temperature is available.

PANEL
When PANEL is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers.
- The temperature can be adjusted to heat the air but the air cannot be cooled below the outside temperature.
- The A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. Blended air temperature is available but the air cannot be cooled below the interior vehicle temperature.

OFF
When OFF is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment.
- The panel/floor door vacuum control motor is at full vacuum and the panel/defrost door vacuum control motor is at full vacuum, closing off airflow to the defrost duct, side window demisters and instrument panel A/C registers.
- The A/C compressor will not operate.
- The blower motor is off.
- The auxiliary blower motor (if equipped) is disabled.
- The coolant control valve (if equipped) is at full vacuum, preventing the flow of warm coolant to the heater core.

PANEL/FLOOR
When PANEL/FLOOR is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at partial vacuum, directing airflow to the instrument panel A/C registers and floor duct.
- Blended air temperature is available.
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

FLOOR
When FLOOR is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at full vacuum and the panel/defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct.
- The temperature can be adjusted to heat the air, but the air cannot be cooled below the outside temperature.
- The A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled.

FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at no vacuum and the panel/floor door vacuum control motor is at partial vacuum, directing airflow to the defroster duct, side window demisters and floor duct.
- The temperature can be adjusted to heat or cool the air below the outside temperature.
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

DEFROST
When DEFROST is selected:
- The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door and panel/floor door vacuum control motors are at no vacuum, directing airflow to the defroster duct and side window demisters.
- Blended air temperature is available.
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.


SYSTEM AIRFLOW DESCRIPTION - EATC

AUTO
When AUTO is selected:
- The temperature control setting is manually set to the desired setting.
- The air inlet door vacuum control motor is automatically controlled by the EATC module, based on the temperature setting.
- The mode door vacuum control motors are automatically controlled by the EATC module, based on the temperature settings.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C compressor is automatically controlled by the EATC module, based on the temperature settings. The A/C compressor will not operate if the outside temperature is lower than approximately 6°C (43°F).
- The blower motor is on. The blower speed is automatically controlled by the EATC module based on the temperature setting, but can be manually overridden.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

OFF
When OFF is selected:
- The air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment.
- The panel/floor door and the panel/defrost door vacuum control motors are at full vacuum, closing off airflow to the defrost duct, side window demisters, floor duct and instrument panel A/C registers.
- The heater control valve is at no vacuum.
- The A/C compressor will not operate.
- The blower motor is off.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled.
- The coolant control valve (if equipped) is at full vacuum, preventing the flow of warm coolant to the heater core.

PANEL
When PANEL is selected:
- The RECIRC request button is enabled. If RECIRC is selected (indicator on), the air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment. If RECIRC is not selected (indicator off), the air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is enabled. When A/C is selected (indicator on), the A/C compressor will operate if the outside temperature is above approximately 6°C (43°F). When A/C is not selected (indicator off), the A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

PANEL/FLOOR
When PANEL/FLOOR is selected:
- The RECIRC request button is enabled. If RECIRC is selected (indicator on), the air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment. If RECIRC is not selected (indicator off), the air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at full vacuum and the panel/floor door vacuum control motor is at partial vacuum, directing airflow to the instrument panel A/C registers and floor duct.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is enabled. When A/C is selected (indicator on), the A/C compressor will operate if the outside temperature is above approximately 6°C (43°F). When A/C is not selected (indicator off), the A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

FLOOR
When FLOOR is selected:
- The RECIRC request button is enabled. If RECIRC is selected (indicator on), the air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment. If RECIRC is not selected (indicator off), the air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at full vacuum and the panel/defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is enabled. When A/C is selected (indicator on), the A/C compressor will operate if the outside temperature is above approximately 6°C (43°F). When A/C is not selected (indicator off), the A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The RECIRC request button is enabled. If RECIRC is selected (indicator on), the air inlet door vacuum control motor is at full vacuum, closing off outside air from entering the passenger compartment. If RECIRC is not selected (indicator off), the air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door vacuum control motor is at no vacuum and the panel/floor door vacuum control motor is at partial vacuum, directing airflow to the defroster duct, side window demisters and floor duct.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is enabled. When A/C is selected (indicator on), the A/C compressor will operate if the outside temperature is above approximately 6°C (43°F). When A/C is not selected (indicator off), the A/C compressor will not operate.
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.

DEFROST
When DEFROST is selected:
- The RECIRC button is disabled. The air inlet door vacuum control motor is at no vacuum, admitting only outside air into the passenger compartment.
- The panel/defrost door and panel/floor door vacuum control motors are at no vacuum, directing airflow to the defroster duct and side window demisters.
- The heater control valve is automatically controlled by the EATC module, based on the temperature settings.
- The A/C request button is disabled. The A/C compressor will operate automatically if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on.
- The auxiliary blower motor (if equipped) is enabled. However, the air cannot be cooled unless the A/C is operating on the main climate control system.