System Operation

ELECTRONIC AUTOMATIC CLIMATE CONTROL







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 panel/defrost door and the panel/floor door vacuum control motors are at no vacuum, closing off airflow to the defrost duct, the side window demisters, the floor duct, the instrument panel A/C registers, and the center console registers (if equipped).
- The A/C compressor will not operate.
- The blower motor is off.

AUTO
When AUTO is selected:
- The temperature control setting is manually set to the desired setting.
- The air inlet door actuator position 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 setting.
- The A/C compressor is automatically controlled by the EATC module based on the temperature setting. The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F).
- The blower motor is on. The blower motor speed is automatically controlled by the EATC module based on the temperature setting, but can be manually overridden.







MAX A/C
When MAX A/C is selected:
- The air inlet door actuator positions the air inlet door to close off outside air from entering 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 and the center console registers (if equipped). A small amount of airflow from the side window demisters will be present.
- 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.







PANEL
When PANEL is selected:
- The air inlet door actuator positions the air inlet door to admit 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 and the center console registers (if equipped). A small amount of airflow from the side window demisters will be present.
- 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.







PANEL/FLOOR
When PANEL/FLOOR is selected:
- The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at partial vacuum and the panel/defrost door vacuum control motor is at full vacuum, directing airflow to the floor duct, the instrument panel A/C registers, and the center console registers (if equipped). A small amount of airflow from the side window demisters will be present.
- 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.







FLOOR
When FLOOR is selected:
- The air inlet door actuator positions the air inlet door to admit 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 and the center console registers (if equipped).
- The temperature can be adjusted to heat the air, but the air cannot be cooled below the outside temperature (If built before 5/9/01).
- The temperature can be adjusted to heat or cool the air below the outside temperature (If built on or after 5/9/01).
- The A/C compressor will not operate (If built before 5/9/01).
- The A/C compressor will operate if the outside temperature is above approximately 6°C (43°F) (If built on or after 5/9/01).
- The blower motor is on.







FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- The panel/floor door vacuum control motor is at partial vacuum and the panel/defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct, the defroster duct, the side window demisters, and the center console registers (if equipped).
- 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.







DEFROST
When DEFROST is selected:
- The air inlet door actuator positions the air inlet door to admit only outside air into the passenger compartment.
- The panel/defrost door and the panel/floor door vacuum control motors are at no vacuum, directing airflow to the defrost duct, the side window demisters, and the center console registers (if equipped).
- 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.

Climate Control System Electrical Components, Part 1:

Climate Control System Electrical Components, Part 2:

Climate Control Electrical Components