Air Distribution and Filtering (Air Distribution)

AIR DISTRIBUTION

NOTE: The air distribution system of this vehicle cannot be equipped with a cabin air filter.

There are 2 sources of air available to the air distribution system:
- Outside air
- Recirculated air

Recirculated air is used when the climate control mode selector is set in the AUTOMATIC and OFF modes or when manually selected in any mode except DEFROST or FLOOR/DEFROST.

Air distribution within the vehicle is controlled by the dual-zone electronic automatic temperature control (EATC) system in the AUTOMATIC mode. The air distribution mode may be overridden by the driver if desired. Four independently actuated air distribution doors are used to direct airflow within the heater core and evaporator core housing and the plenum chamber. Vacuum control motors are used to position these air distribution doors.

The EATC system uses a partitioned plenum chamber, and heater core and evaporator core housing assembly with 2 separate temperature blend doors. This allows for individual temperature settings to be selected for the RH and LH air outlets.

The air distribution system is designed to provide airflow from the defroster duct when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.

Air enters the passenger compartment from the:
- instrument panel A/C registers.
- heater outlet floor ducts.
- windshield defroster duct.
- side window demisters.
- center flow-through console duct.

Passenger compartment air is exhausted from the vehicle through open windows or body air vents.

Heating and Ventilation
The heating and ventilation system has the following features:
- Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
- Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
- Controls the blower motor speed.
- Cooling or heating can be adjusted to maintain the desired temperature.
- The temperature can be adjusted individually by the driver and passenger.

Heater Core
The heater core consists of fins and tubes arranged to extract heat from the engine coolant and transfer it to air passing through the heater core.

Blower Motor
The blower motor pulls air from the air inlet and forces it into the heater core and evaporator core housing and the plenum chamber where it is mixed and distributed.

Heater Core and Evaporator Core Housing
The heater core and evaporator core housing directs airflow from the blower motor through the evaporator core and heater core. All airflow from the blower motor passes through the evaporator core. The airflow is then directed through or around the heater core by the temperature blend door(s). The EATC system uses a partitioned heater core and evaporator core housing with 2 electric actuator positioned temperature blend doors. This allows for separate temperatures to be selected for the RH and LH sides of the passenger compartment.