The driver may select the following different modes of
operation:
| • | DEFOG (FLOOR/WINDSHIELD) |
When operating in AUTO mode, the instrument panel module (IPM) may operate
in several different modes:
If the heater and A/C control is not turned OFF, the IPM will also execute
one of three purge modes at the start of each ignition cycle.
Off Setting
When the climate control system operates in the dual zone mode and you
press the driver temperature control, 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 HVAC module, and out through the floor and windshield
outlets.
The IPM controls 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 IPM determines which one of the following modes is required:
The IPM energizes the mode actuator to command the program-determined
mode.
The information that is supplied to the IPM determines whether the system
will draw the outside air in or recirculate the inside air.
Defog Setting
The IPM energizes the mode actuator to:
| • | Open the defroster door slightly |
| • | Position the AC/Floor door to direct air through the floor outlets |
Air is delivered to the floor and windshield outlets.
Bi-Level Setting
The IPM energizes the air inlet and mode actuators to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the panel and floor
outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
Panel Setting
The IPM energizes the mode actuator to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the panel outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
Floor Setting
The IPM energizes the mode actuator to:
| • | Close the defroster door |
| • | Position the A/C door to direct air through the heater outlets |
| • | Direct a small amount of air through the windshield outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves 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 inlet and mode actuators to:
| • | Open the defroster door |
| • | Position the air inlet door to the outside air position |
| • | Position the A/C door to direct a small amount of air through
the floor outlets |
The IPM energizes the air mix actuators to:
| • | Determine the proper air discharge temperatures |
| • | Position the air mix valves accordingly |
The A/C compressor may still operate in Defrost even if A/C OFF is selected.
The A/C OFF request will be applied to the next manual mode selected.
You cannot force Recirc in Defrost.
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:
Recirc is not allowed during the 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 wake the system up in the AUTO
mode with RECIRC selected.
Dual Zone Setting
Turn the passenger temperature 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.
