Climate Control General Information

SYSTEM AIRFLOW DESCRIPTION

MAX A/C
When MAX A/C is selected:
- The air inlet blend door is at full vacuum, closing off outside air and allowing only recirculated air.
- The defrost blend door is at full vacuum while the footwell blend door is at no vacuum, closing both doors.
- The vent/register blend door is at partial vacuum, directing airflow to the driver side, passenger side and center registers.
- Temperature control is usually set for maximum cold but may be heated if selected.
- Air is picked up at the recirculation opening by the blower motor. With the temperature control set for maximum cold, air flows across the A/C evaporator core, diverting past the heater core, and is then directed into the passenger compartment through the driver side, passenger side and center registers.
- The A/C compressor is enabled.
- The blower motor is ON.

A/C
When A/C is selected:
- The air inlet blend door is at no vacuum, blocking the recirculation passage and admitting outside air.
- All other door positions are the same as described under MAX A/C.
- The temperature setting can be changed manually.
- The A/C compressor is enabled.
- The blower motor is ON.

PANEL
When PANEL is selected:
- The air inlet blend door, with no vacuum being applied, blocks recirculated air and allows outside air. Air flows through the system to the driver, passenger and center registers.
- The vent/register blend door is at partial vacuum to direct airflow to the driver, passenger and center registers.
- The defrost blend door is at full vacuum and the defrost airflow door is at no vacuum, closing off airflow to the windshield defroster hose nozzles and footwell ducts.
- The temperature setting can be changed manually to heat the air, but air cannot be cooled below the outside temperature.
- The A/C compressor is disabled when VENT is selected.
- The blower motor is ON.

PANEL/FLOOR
When PANEL/FLOOR is selected:
- The air inlet blend door is at no vacuum, blocking the recirculation passage and allowing outside air.
- The footwell blend door and the panel airflow door are in the full vacuum position, allowing airflow to blend between the panel vents and the footwell ducts.
- The defrost airflow door is at full vacuum, closing off airflow to the windshield defroster hose nozzle and directing airflow to the heater outlet footwell duct.
- The A/C compressor is disabled.
- The blower motor is ON.

OFF
When OFF is selected:
- The air inlet blend door is at full vacuum, closing off outside air and allowing only recirculated air.
- The vent/register blend door and the defrost, footwell and blend airflow doors are at no vacuum, closing off the passages to the driver, passenger and center registers.
- The blower motor and the A/C compressor are off.

FLOOR
When FLOOR is selected:
- The air inlet blend door is at no vacuum, blocking recirculated air and allowing outside air.
- The footwell airflow door is at the full vacuum position, opening the door and allowing airflow through the footwell ducts.
- The defrost airflow door and the vent/register blend door are in the no vacuum position, closing off airflow to the windshield defroster hose nozzles and driver, passenger and center registers.
- The temperature control can be positioned to mix air flowing through and around the heater core to achieve the selected temperature level.
- The A/C compressor is disabled.
- The blower motor is ON.

FLOOR/DEFROST
When FLOOR/DEFROST is selected:
- The air inlet blend door is in the no vacuum position, blocking recirculated air and allowing outside air.
- The footwell blend door is at full vacuum allowing air to flow through the footwell ducts.
- The defrost blend door is at no vacuum, allowing airflow to both the windshield defroster hose nozzle and side window demister hose nozzle ducts.
- The vent/register blend door is at no vacuum.
- The A/C compressor is enabled to dehumidify the air and reduce windshield fogging.
- The blower motor is on.

DEFROST
When DEFROST is selected:
- The air inlet blend door is at no vacuum, allowing outside air to enter the system.
- The defrost blend door is at no vacuum, directing the airflow to the windshield through the defroster ducts and the side windows through the demister ducts.
- The panel airflow door and the footwell airflow door are at no vacuum, so that most of the incoming air is directed to the windshield defroster hose nozzle. There is also airflow to the side window demister and hose.
- The temperature control knob setting determines the amount of air that is directed through the heater core and the amount that bypasses the heater core.
- The A/C compressor is enabled to dehumidify the air and reduce windshield fogging.
- The blower motor is on.