General Description
The dual zone A/C (CJ2) system provides a comfortable environment inside the passenger compartment regardless of the weather conditions outside of the vehicle.
Many of the components in the dual zone A/C (CJ2) system are the same as the components used in the manually-controlled HVAC system. The following paragraphs give a brief explanation of the components specific to the dual zone A/C (CJ2) system.
Dual Zone A/C System (CJ2)
The dual zone A/C system is a vacuum and electrically controlled heating, ventilating and air conditioning system. Both electronic and vacuum circuits determine air intake and discharge locations.
The electronic circuits control the following aspects of the system:
| • | The mode |
| • | The A/C compressor clutch operation |
| • | The fan operation |
| • | The discharge temperature |
The driver may select a desired interior temperature, a fan speed and one of eight different modes of operation from the system A/C control head.
One of these modes is a fully automatic dual zone mode which determines the following conditions (set by the driver):
| • | The air intake mode (recirc or outside air) |
| • | The air delivery mode (upper, lower, bi-level and defog) |
| • | The fan speed |
| • | The discharge air temperature. |
The passenger side of the vehicle contains a separate control knob on the A/C control head that can increase or decrease air discharge temperature for the passenger side of the vehicle.
A/C Control Head
The automatic A/C control head uses the following types of manual controls:
| • | Push buttons provide control of the mode and the blower speeds. |
| • | Two rotary knobs can set the temperature. |
In the automatic mode the temperature is set by the driver. A microprocessor uses this information to provide the desired temperature level.
The driver can change the blower speed and mode selection at any time. The microprocessor continues to moderate the blower speed and temperature.
Diagnostic testing is performed with a scan tool or through the DIC.
