Air Distribution and Filtering (Air Distribution)

AIR DISTRIBUTION AND FILTERING

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 only used during MAX A/C (if equipped) and OFF modes.

Air distribution within the vehicle is determined by the function selector switch position. Airflow control doors are used to direct airflow within the plenum chamber. Vacuum control motors are used to position these airflow control doors. Refer to Heating and Air Conditioning for a description and operation of each of the system functions.

The air distribution system is designed to provide airflow from the defrost nozzle 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 register.
- floor duct.
- windshield defroster nozzle.
- side window demisters.

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

Instrument Panel Registers
There are registers in the instrument panel, the cluster opening finish panel and the center instrument panel finish panel.

The LH and RH A/C registers are only serviceable as assemblies.

The center A/C registers are also serviceable as assemblies although the barrels can be replaced without removing the A/C register assembly.