Climate Control System (System Airflow Description)
SYSTEM AIRFLOW DESCRIPTION - MANUAL CLIMATE CONTROLMAX 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 door vacuum control motor is at full vacuum and the defrost door and floor door vacuum control motors are at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the floor duct, defroster duct and side window demisters will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- air will be drawn from the recirculated air inlet by the blower motor. When the temperature selection is in the full COOL position, the airflow will be diverted past the heater core and then into the passenger compartment through the instrument panel A/C registers.
- the A/C request switch will be illuminated and will be disabled.
- The A/C compressor will not operate if the outside air temperature is below -1°(30°F). The A/C compressor will resume operation when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
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 door and floor door vacuum control motors are at full vacuum and the defrost door vacuum control motor is at no vacuum, directing airflow to the floor duct and the instrument panel A/C registers. A small amount of airflow from the defroster duct and side window demisters will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- the A/C request switch will be enabled. The A/C compressor will operate and the indicator will be illuminated if the A/C request switch is selected and if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
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 defrost door vacuum control motor is at full vacuum and the panel door and floor door vacuum control motors are at no vacuum, closing off airflow to the passenger compartment outlets.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core.
- the A/C request switch is disabled.
- the blower motor is OFF.
- the auxiliary blower motor is disabled, if equipped.
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 floor door and defrost door vacuum control motors are at full vacuum and the panel door vacuum control motors are at no vacuum, directing airflow to the floor duct and the defroster duct. A small amount of airflow from the instrument panel A/C registers, defroster duct and side window demisters will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- the A/C request switch will be enabled. The A/C compressor will operate and the indicator will be illuminated if the A/C request switch is selected and if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
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 floor door vacuum control motor is at full vacuum and the defrost door and panel door vacuum control motors are at no vacuum, directing airflow to the floor duct, the defroster duct and the side window demisters. A small amount of airflow from the instrument panel A/C registers will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- the A/C request switch will not illuminate and will be disabled. To reduce fogging, the A/C compressor will operate automatically if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
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 floor door, panel door and defrost door vacuum control motors are at no vacuum, directing airflow to the defroster duct and the side window demisters. A small amount of airflow from the instrument panel A/C registers and floor duct will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- the A/C request switch will not illuminate and will be disabled. To reduce fogging, the A/C compressor will operate automatically if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
SYSTEM AIRFLOW DESCRIPTION - ELECTRONIC AUTOMATIC TEMPERATURE CONTROL
AUTO
When AUTO is selected:
- the temperature control setting(s) is/are manually set to the desired setting(s).
- the air inlet door vacuum control motor is automatically controlled by the EATC module, based on the temperature settings.
- 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 air temperature is below -1°C (30°F). The A/C compressor will resume operation when the outside air temperature rises above 2°C (35°F).
- the A/C request switch or the RECIRC button, if pressed, will transfer the system to manual operation.
- the blower motor is ON. The blower motor speed is automatically controlled by the EATC module based on the temperature settings, but can be manually overridden.
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 door vacuum control motor is at full vacuum and the defrost door and floor door vacuum control motors are at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the floor duct, defroster duct and side window demisters will be present.
- the heater control valve is at full vacuum when the temperature selection is in the full COOL position, preventing the flow of hot coolant to the heater core. Otherwise, blended air temperature is available.
- air will be drawn from the recirculated air inlet by the blower motor. When the temperature selection is in the full COOL position, the airflow will be diverted past the heater core and then into the passenger compartment through the instrument panel A/C registers.
- the A/C request switch will be illuminated and will be disabled.
- The A/C compressor will not operate if the outside air temperature is below -1°C (30°F). The A/C compressor will resume operation when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
- the auxiliary blower motor is enabled, if equipped.
OFF
When OFF is selected:
- the air inlet door vacuum control motor is at full vacuum, closing off outside air to the passenger compartment.
- the defrost door vacuum control motor is at full vacuum and the floor door and panel door vacuum control motors are at no vacuum, closing off airflow to the passenger compartment outlets.
- the heater control valve is at full vacuum, preventing the flow of hot coolant to the heater core.
- the blower motor is OFF.
PANEL
When PANEL is selected:
- the RECIRC button is enabled. If the RECIRC button is pressed (indicator ON) the air inlet door vacuum control motor is at full vacuum, closing off outside air to the passenger compartment. If the RECIRC button is not selected (indicator OFF), the air inlet door vacuum control motor will be at no vacuum, admitting only outside air into the passenger compartment.
- the defrost door and panel door vacuum control motors are at full vacuum and the floor door vacuum control motor is at no vacuum, directing airflow to the instrument panel A/C registers. A small amount of airflow from the floor duct, defroster duct and side window demisters will be present.
- the heater control valve is automatically controlled by the EATC module based on the temperature settings.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when 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 switch is enabled. When the A/C request switch is pressed (indicator ON), the A/C compressor will operate if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
PANEL/FLOOR
When PANEL/FLOOR is selected:
- the RECIRC button is enabled. If the RECIRC button is pressed (indicator ON), the air inlet door vacuum control motor is at full vacuum, closing off outside air to the passenger compartment. If the RECIRC button is not selected (indicator OFF) the air inlet door vacuum control motor will be at no vacuum, admitting only outside air into the passenger compartment.
- the defrost door, panel door and floor door vacuum control motors are at full vacuum, directing airflow to the instrument panel A/C registers and to the floor duct. A small amount of airflow from the defroster duct and side window demisters will be present.
- the heater control valve is automatically controlled by the EATC module based on the temperature settings.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when 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 switch is enabled. When the A/C request switch is pressed (indicator ON), the A/C compressor will operate if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
FLOOR
When FLOOR is selected:
- the RECIRC button is enabled. If the RECIRC button is pressed (indicator ON), the air inlet door vacuum control motor is at full vacuum, closing off outside air to the passenger compartment. A RECIRC door time-out strategy will be used to prevent fogging and the RECIRC function will automatically be turned off after approximately 4 minutes. If the RECIRC button is not selected (indicator OFF), the air inlet door vacuum control motor will be at no vacuum, admitting only outside air into the passenger compartment.
- the defrost door and floor door vacuum control motors are at full vacuum and the panel door vacuum control motor is at no vacuum, directing airflow to the floor duct. A small amount of airflow from the instrument panel A/C registers, defroster duct and side window demisters will be present.
- the heater control valve is automatically controlled by the EATC module based on the temperature settings.
- temperature control can be adjusted by directing the airflow through and around the heater core. Only when 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 switch is enabled. When the A/C request switch is pressed (indicator ON), the A/C compressor will operate if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
FLOOR/DEFROST
When FLOOR/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 floor door vacuum control motor is at full vacuum and the defrost door and panel door vacuum control motors are at no vacuum, directing airflow to the floor duct, defroster duct and side window demisters. A small amount of airflow from the instrument panel A/C registers will be present.
- the heater control valve is automatically controlled by the EATC module based on the temperature settings.
- temperature control can be adjusted by directing the airflow through and around the heater core.
- the A/C request switch will be disabled and will not illuminate. The A/C compressor will operate automatically if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.
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 floor door, defrost door and panel door vacuum control motors are at no vacuum, directing airflow to the defroster duct and side window demisters. A small amount of airflow from the instrument panel A/C registers and the floor duct will be present.
- the heater control valve is automatically controlled by the EATC module based on the temperature settings.
- temperature control can be adjusted by directing the airflow through and around the heater core.
- the A/C request switch will be disabled and will not illuminate. The A/C compressor will operate automatically if the outside air temperature is not below -1°C (30°F). If the outside air temperature has gone below -1°C (30°F), A/C compressor operation will resume when the outside air temperature rises above 2°C (35°F).
- the blower motor is ON.