Rear HVAC System Overview

Rear HVAC System Overview

The manual temperature control and auto temperature control rear HVAC systems are equipped with a common rear HVAC housing that combines A/C and heating capabilities into a single unit mounted within the passenger compartment behind the right quarter interior trim panel. The rear HVAC housing includes:






1 Rear HVAC housing

2 Blower motor resistor

3 Blower motor

4 Mode door and actuator

5 Heater core

6 Blend door and actuator

7 A/C evaporator

8 A/C expansion valve

9 Wire harness

Based upon the rear temperature selected, conditioned air can exit the rear HVAC housing through one or a combination of the two rear housing outlets: ceiling or floor. The ceiling outlet is located at the top-rear of the housing and the floor outlet is located at the front of the rear housing. Once the conditioned air exits the rear HVAC housing, it is further directed through molded plastic ducts to the outlets at the rear of the passenger compartment. These outlets and their locations are as follows:

• Ceiling Outlets - There are four ceiling outlets in the headliner. One located at each outboard side of the intermediate seat position and one located in front of each rear seat position.

• Floor Outlet - There is one floor outlet in the right quarter interior trim panel located behind the right rear door area.

The rear HVAC system pulls interior air through the opening in the rear quarter interior trim panel and into the rear blower motor in the rear HVAC housing, then through the rear A/C evaporator. Air flow can be directed either through or around the rear heater core by adjusting the blend-air door with either the front or the rear temperature control (depending on the front HVAC control setting). The air flow is then directed to the floor or ceiling outlets depending on the mode selected by the mode control. Air flow velocity can be adjusted with the blower speed control located on either the front HVAC control or the rear HVAC control (depending on the front HVAC control setting).

The headliner air outlets receive airflow from the rear HVAC housing through the molded plastic ceiling duct, which connects to the headliner duct and headliner air outlets. Airflow direction from the headliner air outlets can be adjusted by moveable vanes and the headliner air outlets can be serviced separately.

The rear floor outlet receives airflow from the rear HVAC housing through the molded plastic floor distribution duct, which connects to the rear floor outlet located in the rear quarter interior trim panel. The airflow from the rear floor outlet is directed by fixed vanes in the outlet and air flow direction cannot be adjusted. The rear floor outlet is integral to the rear quarter interior trim panel.

The rear A/C system is designed for use of non-CFC, R-134a refrigerant and uses an "H" valve-type thermal expansion valve to meter the flow of refrigerant to the rear A/C evaporator.