This is from the service manual for that vehicle
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, AUTOMATIC and OFF modes if equipped with EATC, or MAX A/C and OFF if equipped with manual A/C.
Air distribution within the vehicle is determined by the function selector switch position, if equipped with manual A/C. If equipped with EATC, air distribution is controlled by the electronic automatic temperature control system in the AUTOMATIC mode, but it can be overridden by the driver if desired. Airflow control doors are used to direct airflow within the heater air plenum chamber. Vacuum control motors are used to position these airflow control doors.
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 make sure defrost is available in the event of a system vacuum leak.
Air enters the passenger compartment from the:
* instrument panel A/C register.
* floor duct.
* defroster duct.
* side window demisters.
The center panel duct, defroster duct and side window demister hoses are supplied together as a single air distribution assembly.
Passenger compartment air is exhausted from the vehicle through open windows or luggage compartment air vents.
Friday, August 20th, 2010 AT 7:13 PM