Air Distribution System

Air Distribution (I/P Outlets):

Air Distribution (Bi-Level):

Air Distribution (Floor):

Air Distribution (Defrost):

Air Distribution (Mix/Blend):

Since, by design, all of the air flow through the heater A/C module must pass through the evaporator, system discharge air temperature is regulated by varying the amount of ambient non "RECIRC" or in-vehicle "RECIRC" mode air that passes through the heater core. Control of air through the system is regulated by vacuum. At various positions on the control assembly, mode valves mix and direct cooled, heated and outside air through the air ducts. The flow of air from the heater system during the various modes of operation is as follows:

^ Off - Floor outlet, forced air only.
^ Max - Instrument panel outlets, recirculated air.
^ Bi-Level - Instrument panel outlets and floor outlets - outside air.
^ Vent - Instrument panel outlets, outside air, no compressor operation.
^ Heater Floor outlets and a small among from defroster duct.
^ Mix/Blend - Equal amounts floor and defrost.
^ Lower - Outside air directed to the floor vents.
^ RECIRC - In the "RECIRC" mode, inlet air to the heater A/C module is drawn from the vehicle's interior rather than from outside of the vehicle. This mode is used for maximum air cooling/dehumidification.
^ Defrost - Defroster outlets and a small amount from the floor outlets. The operation of the cooling fan is controlled by the PCM through the cooling fan relay.

Vacuum Lines

Vacuum lines are molded to a connector which is attached to main vacuum line from the engine compartment. In case of leakage or hose collapse, It will not be necessary to replace the entire harness. Replacement can be made by cutting the hose and inserting a plastic connector.

Vacuum Tank

During heavy acceleration, the vacuum supply drops A check valve in the vacuum line maintains vacuum in the vacuum tank so that, under load conditions. vacuum will be available for use.

Ducts and Outlets

A system of ducts and outlets directs air to the passenger compartment. In cases of poor air output, defroster. heater. A/C and vent ducts should be checked for obstructions, such as leaves dirt, objects, etc. A/C systems also come equipped with side window defoggers.

Ventilation

The air distribution system provides fresh air ventilation for the passenger compartment in all operating modes. Even in the "OFF" mode, fresh outside air is forced into the air distribution system by the forward movement of the vehicle.

After being warmed or cooled to the desired temperature, the air is discharged from the outlets appropriate to the selected operating mode. When all of the windows are closed, the addition of outside air builds a slight positive pressure within the passenger compartment. The pressure forces stale air to leave the vehicle through a pressure relief valve.