Automatic Climate Control

Temperature Settings
With the system in any mode but "OFF" and temperature between 19°C and 29°C (66°F and 84°F), turning the temp knob in either direction, or pressing the warm or cold button, increases or decreases temperature one degree. If the knob is turned in the decrease direction or cool button is pressed, to achieve the lowest setting, with the set temperature at 18°C (65°F), temperature drops immediately to 16°C (60°F). If the knob is turned in the increase direction or the warm button is pressed to achieve the highest setting, with set temperature at 29°C (85°F), set temperature will jump immediately to 32°C (90°F).

An increase or decrease of the set temperature signals the Air Conditioning Programmer (ACM) to take the steps necessary (change blower speed, change air discharge location, change discharge temperature) to bring the passenger compartment temperature to the new temperature.

NOTICE: The compressor does not run in the "OFF" or "ECON" setting therefore cooling the interior of the vehicle beyond the outside air temperature is not possible in "OFF" or "ECON" settings.

"OFF" Setting
With this setting selected, the blower motor or A/C compressor will not operate. The system will however still try to reach the temperature range selected. For example, if 21°C (70°F) is selected and it is a cold day, the car may eventually reach the 21°C (70°F) temperature range but over an extended period of time because the blower fan is not operating. If it is a hot day, it can only cool the car to near outside air temperature since in this position the blower motor and A/C compressor will not run. This selection forces the air inlet valve open to outside air and sends half of the air out of the floor ducts and half of the air out of the defroster outlets.

The "OFF" mode does not affect the Rear Defog and De-ice, Outside Temperature, and Set Temperature. If the manual Recirc mode has been previously activated, the "OFF" key will cause the Recirc mode door to return to the automatic control.

"ECON" Setting
In this setting, the system will not allow the A/C compressor to operate. Thus the system cannot cool the vehicle to a temperature any colder than the outside air temperature. This setting automatically determines blower speed and air outlet positions based on different inputs. All incoming air into the HVAC module is from outside. Depending on the heating or cooling requirement, most of the air will enter the passenger compartment from one of the following four positions:
^ Out the floor heater outlet, rear outlets.
^ Out the A/C outlets, rear outlets.
^ A/C, heater and rear outlets.
^ Defrost, heater and rear outlets.

"AUTO" Setting
In this setting everything is controlled automatically based on the various A/C system inputs. In this setting, the system has the capability of any fan blower speed, any air inlet position, and any air outlet position to attain and maintain the selected temperature. Depending on the heating or cooling requirements, most of the air will enter the passenger compartment from one of the following four positions:
1. Out the floor heater outlet, rear outlets.
2. Out the A/C outlets, rear outlets.
3. Out the A/C, heater and rear outlets.
4. Out the Defrost, heater and rear outlets.

"DEFOG" Setting
This setting splits the air flow between the defroster and floor ducts. At temperatures above 4°C (40°F), the compressor is enabled to dehumidify the air entering the passenger compartment.

DEFROST Setting
In this setting, everything is controlled automatically, as in "AUTO," except that most of the air is delivered out of the defroster grille on the top of the instrument panel.

DUAL ZONE Setting (CJ2)
The dual zone is activated by pressing the center of the passenger temperature control button. The dual zone can also be activated by pressing either the top or bottom arrow.

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.

In the dual zone system, the air mix valve is split in half and each half has its own actuator.

When the system is operating in dual zone mode, the Air Conditioning Programmer (ACM) operates each actuator separately. Driver side discharge temperature is dependent upon:
^ Coolant temperature.
^ Outside temperature.
^ In-Vehicle temperature.
^ Sun Load sensor.
^ Heater and A/C control "SET" temperature.

Passenger side discharge air temperature is dependent upon:
^ Coolant temperature
^ Outside temperature.
^ In-Vehicle temperature.
^ Sun Load sensor.
^ Passenger temperature control setting information.

When the system is operating in any mode but dual zone mode, the actuators are operating in unison as the system works to maintain the Heater and A/C Control "SET" temperature.

"RECIRC" Setting
When the "RECIRC" button is pressed the LED will illuminate. The RECIRC switch sends a message to the programmer which causes air to be recirculated through the HVAC system from the passenger compartment.

When recirc mode is selected, the programmer allows vacuum to be applied to the Outside air recirc valve actuator which positions the outside air recirc valve in the recirculate position.

Recirc mode is available for operation in UPPER, LOWER and BI-LEVEL modes. Recirc is not allowed during DEFROST and DEFOG modes as this could cause windshield fogging.

While RECIRC is operational any ignition cycle will cancel the function, and allow outside air into the system.
The manual recirc will remain activated until one of the following occurs:
^ The "RECIRC" button is pressed a second time.
^ The front defrost mode is selected.
^ The "DEFOG" mode is selected.
^ The "AUTO" button is pressed.
^ The "OFF" button is pressed.