Auxiliary Climate Control

Auxiliary A/C Components And Controls:

An optional auxiliary air conditioning and heating system is available. The system is a one-piece unit that is located on the LH side of the vehicle between the side windows and the floorpan, behind the rear wheel well. The driver has primary control of the auxiliary air conditioning and heating system or can transfer control to a rear passenger control panel.

All of the auxiliary A/C-heater system components are serviceable from the inside of the vehicle except the lines.

Air Distribution
A vertical duct supplies air to the integral headliner air conditioning duct. Air is supplied to the passengers through adjustable registers. The heater floor duct is integral to the side trim panel and has a fixed register for optimum heater air distribution. The trim panel connects directly to the auxiliary air conditioning and heater assembly.


The auxiliary A/C and heating system has the following features:
^ The auxiliary A/C and heating system is functioning whenever the instrument panel mounted A/C control is in any position except OFF.
^ The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
^ Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
^ The temperature blend door and the A/C damper door are controlled by electric actuator motors.
^ Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
^ Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the A/C damper door to direct air flow between the panel (headliner) registers and the floor duct.

Blower Motor
The auxiliary air conditioning system contains a blower motor which is controlled by the heater blower motor switch on the front or rear auxiliary A/C control.







Control Assembly
The auxiliary A/C system has dual controls for the driver and rear passengers consisting of temperature, blower speed, and mode. The front auxiliary A/C control is mounted in the overhead console or the front floor console. The rear auxiliary A/C control is mounted in a separate overhead console positioned on the roof trim panel or the rear of the front floor console.

Heater Core
The auxiliary A/C system uses a rear heater core which operates in the same manner as the front heater core.

A/C Evaporator Core
The auxiliary A/C system uses a rear A/C evaporator core which operates in the same manner as the front A/C evaporator core.

Thermostatic Expansion Valve
An A/C evaporator expansion valve automatically regulates the flow of refrigerant into the auxiliary A/C evaporator core. It is also the dividing point in the system between low and high-pressure sides.

The temperature sensing bulb measures the temperature of the refrigerant in the suction line and transmits it to the A/C evaporator expansion valve. This temperature variation regulates the refrigerant flow to the auxiliary A/C evaporator core.
^ When the bulb senses a high temperature, the A/C evaporator expansion valve opens and floods refrigerant through the auxiliary A/C evaporator core.
^ When the bulb senses a low temperature, the A/C evaporator expansion valve starts closing to shut off the refrigerant to the auxiliary A/C evaporator core.

Refrigerant Lines: Part 1 0f 2:

Refrigerant Lines: Part 2 Of 2:

Underbody A/C-Heater Lines
The auxiliary lines are two-piece tubes that are secured to the underbody of the vehicle. New auxiliary line kits are only available with multiple-piece lines for ease of installation.