Air Distribution System

A vacuum regulates the control of air through the system. Various positions on the control cause the mode valves to mix and direct cooled, heated and outside air through the air ducts.

Air flows through the HVAC system as described for each of the following modes:

- OFF
A light bleed of air flows from all of the outlets.

- MAX
Recirculated air flows through the instrument panel outlets.

- NORM A/C
Outside air flows through the instrument panel outlets.





- BI-LEVEL
Outside air flows through the following outlets:
- The instrument panel outlets
- The floor outlets





- VENT
Outside air flows through the instrument panel outlets.
The compressor does not operate.





- HEATER
Most of the air flows through the floor outlets. A small amount of air flows through the defroster duct.





- DEFOG
Equal amounts of air flow through the floor outlets and the defrost outlets.





- DEFROST
Most of the air flows through the defroster outlets. A small amount of air flows through the floor outlets.

The operation of the cooling fan is controlled by the PCM through the cooling fan relay.

Ducts and Outlets

A system of ducts and outlets direct air to the passenger compartment.
Obstructions in the ducts and outlets may cause poor air output. Inspect the following air passages for obstruction, such as leaves or dirt:

- The defroster duct
- The heater duct
- The A/C ducts
- The vent ducts

A/C systems also come equipped with side window defoggers.

Passenger Compartment Air Filter Description

The filters are located in the heater and evaporator module in front of the evaporator core. The filters are accessed through a cover near the lower left front corner of the heater and evaporator module. These filters are designed to filter:

- Fresh air entering the vehicle.
- Recirculated air within the vehicle.

In addition to filtering dust particles out of the air, the filters are also designed to reduce unwanted odors that may enter into the vehicle.

The filter assembly consists of three separate interlocking elements.
Each of these filters are identical in appearance and operation. These filters are removed and installed one at a time through the access door. The filters may be bent slightly which will allow for easier removal and installation.

Each filter element has a tab at the lower left corner to assist in the installation and removal process. The tab on the filter is channeled which helps to align the interlocking feature of the filters.

The filters have a 12 months or 20,000 km (15,000 miles) change interval. These filters may require frequent change intervals depending on driving conditions.

Vacuum Tank Description

The vacuum supply drops during heavy acceleration. A check valve is present in the vacuum tank. The check valve maintains vacuum so that vacuum will be available for continuous use under load conditions.

Vacuum Hose Harness Description

Vacuum lines are molded to a connector which is attached to the control knob.

It is not necessary to replace the entire harness if the hoses leak or collapse. You can simply cut the hose and insert a plastic connector.