System Operation

Temperature Setting

To set a particular temperature, press the temperature set "up" or "down" button until the desired temperature is displayed.

The "down" button will lower temperature to 18°C (65°F). If pressed again after the 18°C (65°F) temperature is set, the setting will lower to 15°C (60°F). At this, the lowest setting, the system will provide maximum cooling and override automatic control.

The "up" button will raise temperature to 29°C (85°F). If pressed again after the 29°C (85°F) temperature is set, the setting will jump up to 32°C (90°F). At this, the highest setting, the system will provide maximum heating and override automatic control.

The blower motor will be delayed in the heater mode until coolant has reached an adequate temperature to provide heat. When the temperature is set to 32°C (90°F) there will be no blower delay.

Control Assembly

A/C Control Head:

Control Head System Response:

An LED indicator goes "ON" when an operating mode button is pressed. By pressing specific buttons, the operator can select the desired HVAC operating mode(s) or temperature settings for:

- One of the seven operating modes (Automatic, Recirculate, Bi-Level, Vent, Heater, Defogger/Defroster, and Defogger).
- WARM or COOL.
- Two blower settings: auto, manual 0-10.
- Rear window defrost.
- "OFF."

"OFF" - In this setting, the fan blower motor and the air conditioner compressor will not run. The system will try to reach the setting selected. If 21°C (70°F) is selected and it is a cold day, the vehicle's interior will reach the 21°C (70°F) range; but it will take longer because the fan is not running. If it is a hot day, the interior will cool but only down to about that of the outside temperature.

AUTOMATIC - In this setting, temperature is controlled automatically by the electronic automatic air conditioning system. The system will adjust to the temperature range selected, and will maintain that temperature. The fan blower speed will vary automatically unless it is changed with the "down" or up push buttons.

RECIRCULATE - In this setting, maximum cooling is offered by recirculating passenger compartment air and distributing it through the instrument panel outlets. If the outside air (ambient) temperature sensor detects an ambient temperature of less than 40°F, the LED on the "RECIRC" button will light for approximately one second; then the system will switch to "AUTO" mode and the corresponding LED will light. The "RECIRC" mode will not operate under 40°F.

BI-LEVEL - By using this setting, the system will let air into the vehicle through the floor (heater) and air conditioner outlets. This setting will bring the temperature to the range selected. It will control fan blower speed by using the input signals from the CCM and individual sensors. It also operates to defog side windows. The fan blower speed can be adjusted by using "down" or "up" push buttons.

VENT - The compressor will not run in this setting. The system will adjust to the temperature selected, but cannot cool the vehicle's interior colder than outside temperature. This setting automatically controls the fan blower speed, unless the fan is overridden by the "down" or "up" pushbuttons.

HEATER - In this setting, most air entering the vehicle is forced to the floor with a small amount directed to the defroster outlets. This setting
automatically controls the fan blower speed, unless the fan is overridden by the "down" or up pushbuttons. In-vehicle temperature will adjust to the temperature setting selected.

DEFOGGER - To enter this mode, both the "defrost" and "heater" buttons must be depressed simultaneously. Upon entry, both LED's will be illuminated and blower air will be split between the defroster and floor outlets.

DEFROSTER - With this setting, all air is forced to the windshield. The fan blower will turn "ON" to a fixed high speed with no delay. After start-up, the "High" fan blower speed can be readjusted by pushing "down" or "AUTO."

At ignition "ON," a small amount of airflow is directed to the floor. This purges the heater core and prevents the windshield from fogging The purge mode duration lasts for 15 seconds. If a blower delay is required, the purge mode is entered at the completion of the delay.

Entering manual blower or the front defrost mode will override the purge mode.

REAR DEFOGGER/DEFROSTER - With this setting, the operator may defrost or defog the rear window, and activate the heated mirrors on convertible, hardtops and coupes, but only with the ignition in the "ON" position and the engine running. The first time the button is pressed, the unit will run for ten minutes, then the unit will shut "OFF." After it has been warmed up, it will run for five minutes when reactivated.

FAN SPEED - When the fan "AUTO" button is pushed, fan speed is controlled
automatically by the electronic automatic air conditioning system. To override the automatic fan speed control, push the fan "up" or "down" button. Upon pressing either the fan "up" or "down" button, the LCD display on the control head will show the blower symbol and current blower speed. There are 10 blower speed numbers representing the blower speed range. The number 1 represents low blower speed while 10 represents high blower speed. The blower will be delayed in the heat mode until the coolant reaches an adequate temperature to provide
heat.

OUTSIDE HEATED MIRROR. This setting will operate the heated mirrors on
convertibles. The first time the button is pressed, the unit will run for
approximately ten minutes, then shut "OFF." After completing this cycle, the unit will run for approximately five minutes when reactivated. The outside heated mirrors will only operate with the ignition in the "ON" position and the engine running.