General Description

Both A/C systems are designed to provide a comfortable environment inside the passenger compartment, regardless of weather conditions outside of the vehicle. The systems do this by cooling, dehumidifying, heating and circulating the air that enters the passenger compartment.

Both systems consist of four different major parts:

^ Refrigeration system.
^ Heater system.
^ Air distribution system.
^ Mode/temperature control system.

Most aspects of the HVAC systems that are unique to these systems are discussed here, along with the mode/temperature control systems.
Vehicles equipped with the dual zone A/C systems may also be equipped with steering wheel controls that operate some A/C system and radio functions.

DUAL ZONE A/C SYSTEM (CJ2)

The dual zone A/C system is a vacuum and electronically controlled heating, ventilating and air conditioning system. Both electronic and vacuum circuits determine air intake and discharge locations. Electronic circuits also control mode, A/C compressor clutch operation, fan operation and discharge air temperature.

The driver may select a desired interior temperature, fan speed and one of eight different modes of operation from the control assembly. One of these modes is a fully automatic dual zone mode. In this mode the system determines the appropriate air intake, discharge locations, fan speed, and discharge air temperature, according to the driver or passenger selected temperature and information provided by the system's network of sensors. The passenger, through the separate passenger side temperature control panel is able to significantly increase or decrease air discharge temperature on that side of the vehicle.

The automatic A/C system utilizes a variable displacement orifice tube (VDOT) type refrigeration system. This refrigeration system is described in Heating, Ventilation, and Air Conditioning.