General Description

The A/C system provides the following features:

^ Cooled or dehumidified air for the comfort of the occupants
^ Power ventilation
^ Windshield defrosting
^ Side window defrosting

During most operating conditions, outside air enters the vehicle in the following manners:

^ The blower motor pulls in outside air through the heater and air conditioning modules.
^ The forward movement of the vehicle forces in outside air.

Air is pushed by the blower motor, along the following path:

1. Through the evaporator core
2. Through the heater core
3. Into the passenger compartment

If the ambient temperature is above 7°C (45°F), the refrigeration system will chill the evaporator to almost freezing. This action permits the operation of the following components:

^ The air conditioner
^ The defroster

As the air passes through the evaporator, the air temperature drops. Air moisture condenses on the evaporator core fins. A gravity feed through a drain hole removes the moisture from the vehicle. This action dehumidifies the air.

From the evaporator, some or all of the air may pass through the heater core. If the system is in the heating mode, the engine coolant warms the air. Any of the air which is not to be heated will mix with the heated air before entering the passenger compartment.

If the user selects the maximum air conditioning mode, most of the air that enters the blower motor is from the passenger compartment (recirculated).

The air from the passenger compartment is usually cooler than the outside air. The other modes use outside air.

Side Window Defogging

Air is supplied to the side window defogger outlets in all modes except the following modes:

^ OFF
^ UPPER

The side window defogger outlets are located at both ends of the instrument panel.

Auxiliary Heater (C36)

An auxiliary heating option is available for vehicles sold in Canada. The auxiliary heating option includes a separate blower module which houses the following components:

^ A heater core
^ A blower motor

This auxiliary heating option is standard equipment on all Canadian vehicles that are equipped with third-row seating. The auxiliary heater provides an increased level of comfort for passengers in the rear of the vehicle. Major components of the auxiliary heating system include:

^ Additional underhood heater hoses/pipes
^ Auxiliary heater water shutoff valve
^ Front-to-rear heater hoses/pipes
^ Rear fan-master control
^ Rear fan-temperature control
^ Heater A/C module which consists of the following components:
- The blower motor
- The blower motor resistor
- The rear temperature valve electric actuator
- The heater inlet hoses
- The heater outlet hoses
- A heater core

Rear Air Conditioning (C34)

Rear A/C (C34):

A rear air conditioning option (C34) is available. This option provides an increased level of comfort for passengers in the rear of the vehicle. The rear air conditioning system includes the following major components:

^ Additional underhood heater hoses/pipes
^ Front-to-rear heater hoses/pipes
^ Additional underhood refrigerant hoses/pipes
^ Rear fan-master control
^ Rear fan-temperature control
^ A heater A/C module which consists of the following components:
- The blower motor
- The blower motor resistor
- The rear inlet hoses
- The rear outlet hoses
- The refrigerant hoses (evaporator core inlet and outlet)
- The evaporator core
- A thermal expansion valve

The rear heater A/C module is an independent heating and air conditioning system. The rear heater A/C module is located behind the left quarter trim panel. Coolant flow is routed through the additional heater hoses/pipes as follows:

1. From the engine compartment
2. Under the vehicle
3. To the rear heater A/C module
4. To the rear heater core

The front air conditioning system directly supplies refrigerant flow to the rear evaporator. The front air conditioning system has extended hoses and pipes which are routed as follows:

^ From the engine compartment
^ Under the vehicle
^ To the heater A/C module