Heating and Ventilation

HEATING AND VENTILATION

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

Recirculated air is used when the electronic manual temperature control (EMTC) mode selector is set in MAX A/C or OFF, or if the RECIRC button is selected in any mode except DEFROST. If the vehicle is equipped with electronic automatic temperature control (EATC), recirculated air is used in OFF, and is available in all modes except DEFROST.

Air distribution within the vehicle is determined by the EMTC mode selections, or is controlled by the EATC system in the AUTO mode. The air distribution mode on EATC vehicles may be overridden by the driver if desired. Three airflow mode doors are used to direct airflow within the heater core and evaporator core housing and the plenum chamber.

Vehicles equipped with dual-zone EMTC and EATC systems use 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 airflow mode doors are similar for EMTC and EATC systems, therefore the airflow mode for the RH and LH outlets will remain similar in all modes, regardless of the temperature(s) selected.

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

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