Operating Modes

The driver may select the following different modes of operation:
^ OFF
^ AUTO
^ VENT
^ FLOOR/WINDSHIELD
^ MID/FLOOR
^ MID
^ FLOOR
^ FRONT DEFROST

When operating in AUTO mode, the Instrument Panel Module (IPM) may operate in several different modes:
^ MID/FLOOR
^ MID
^ FLOOR

The IPM may also access three purge modes when certain conditions exist.

OFF SETTING
When the climate control system operates in the dual zone mode and you press the OFF button once, the dual zone function will turn off. If you press the OFF button twice, the whole climate control system will turn off. This turns off the blower motor and the A/C compressor.

When the vehicle is moving, air flowing over the vehicle increases the air pressure just ahead of the windshield. This forces air into the outside air inlet, through the heater and A/C module assembly, and out through the floor and windshield outlets.

The IPM operates the air mix valve. The IPM attempts to match the inside and driver selected temperatures. Since the compressor is not running, the system air may be warmed but not cooled.

AUTO SETTING
The blower motor turns ON. The IPM automatically controls the blower speed. The driver may override the automatic blower control by pressing the fan speed switch.

The IPM evaluates the information supplied by the following components:
^ The heater and the A/C control
^ The network of sensors

The IPM determines whether one of the following modes is required:
^ MID/FLOOR
^ MID
^ FLOOR

The IPM energizes the mode actuator to enter this mode.

The information that is supplied to the IPM determines whether the system will draw the outside air in, or recirculate the inside air.

FLOORS/WINDSHIELD SETTING
The A/C compressor activates if the outside temperature is above 3°C (38°F). The A/C compressor runs in order to keep the evaporator core at about 1°C (33°F), as long as you do not press the VENT button.

The IPM energizes the air mix actuators to:
^ Open the defroster door
^ Position the air inlet door to the outside air position
^ Position the A/C door to direct air through the floor outlets

The blower pulls the outside air into the system. The air is cooled and dehumidified. The adjusted air is heated as necessary. Air is delivered to the floor and windshield outlets.

MID/FLOOR SETTING
The A/C compressor activates if the outside temperature is above 3°C (38°F). The A/C compressor operates in order to keep the evaporator core at about 1°C (33°F), as long as you do not press the VENT button.

The IPM energizes the air mix actuators to:
^ Close the defroster door
^ Position the air inlet door to the outside air position
^ Position the A/C door to direct air through the A/C vents and the floor outlets

The blower pulls the outside air into the system. The air is cooled and dehumidified. The adjusted air is heated as necessary. Air is delivered to the floor and instrument panel outlets.

The IPM energizes the air mix actuators to:
^ Determine the proper air discharge temperature
^ Position the air mix valve accordingly

MID SETTING
Access the MID mode by using the IPM when operating in AUTO mode.

The A/C compressor activates if the outside temperature is above 3°C (38°F). The A/C compressor operates in order to keep the evaporator core at about 1°C (33°F), as long as you do not press the VENT button.

The IPM energizes the air mix actuators to:
^ Close the defroster door
^ Position the air inlet door to the outside air position
^ Position the A/C door to direct air through the A/C vents

The IPM energizes the air mix actuators to:
^ Determine the proper air discharge temperature
^ Position the air mix valve accordingly

FLOOR SETTING
The IPM energizes the air mix actuators to:
^ Close the defroster door
^ Position the air inlet door to the outside air position
^ Position the A/C door to direct air through the heater vents
^ Direct a small amount of air through the windshield outlets

The IPM energizes the air mix actuators to:
^ Determine the proper air discharge temperature
^ Position the air mix valve accordingly

FRONT DEFROST SETTING
The blower motor turns ON. You may manually adjust the blower speed using the fan switch. The A/C compressor activates if the outside temperature is above 3°C (38°F).

The IPM energizes the air mix actuators to:
^ Open the defroster door
^ Position the air inlet door to the outside air position
^ Position the A/C door to direct some of the air through the floor outlets

The IPM energizes the air mix actuators to:
^ Determine the proper air discharge temperature
^ Position the air mix valve accordingly

You cannot turn off the A/C compressor.

RECIRC SETTING
When you select the recirc mode, the programmer energizes the air inlet actuator. The air inlet actuator positions the air inlet valve to the recirculate position. The recirc mode operates in the following modes:
^ FLOOR/WINDSHIELD
^ MID/FLOOR
^ MID
^ FLOOR

Recirc is not allowed during the FRONT DEFROST mode. This may cause windshield fogging.

The RECIRC function will operate for the entire ignition cycle. Pressing the RECIRC button with the system OFF, will return the system to the last setting (prior to the system being turned OFF).

DUAL ZONE SETTING
Adjust the passenger control to select the dual zone mode. The IPM energizes the driver and the passenger air mix valves independently. The passenger may operate the passenger temperature control to request a warmer or a cooler temperature on the passenger side of the vehicle. The IPM energizes the passenger air mix valve actuator to increase or decrease the passenger side discharge temperature, if the set temperature is not the maximum hot or maximum cold setting.