MTC-24
AIR CONDITIONER CONTROL
Revision: January 2005 2004 Quest
AIR CONDITIONER CONTROL PFP:27500
Description EJS001UD
The front air control provides regulation of the vehicle's interior temperature. The system is based on the posi-
tion of the front air controls temperature switch selected by the driver. This is done by utilizing a microcom-
puter, also referred to as the front air control, which receives input signals from the following three sensors:
● Ambient sensor
● Intake sensor
● PBR (Position Balanced Resistor).
The front air control uses these signals (including the set position of the temperature switch) to control:
● Outlet air volume
● Air temperature
● Air distribution
The front air control also provides separate regulation of the vehicle's interior temperature for the rear passen-
ger area. The system is based on the temperature and rear blower settings selected from rear control
switches located on the front air control, or from the temperature and rear blower settings selected from rear
control switches on the rear air control, when the front air control switches are set to the rear position.
The front air control is used to select:
● Outlet air volume
● Air temperature/distribution
Operation EJS001S2
AIR MIX DOOR CONTROL
The air mix door is controlled so that in-vehicle temperature changed based on the position of the temperature
switch.
BLOWER SPEED CONTROL
Blower speed is controlled based on front and rear blower switch settings.
When blower switch is turned, the blower motor starts and increases air flow volume each time the blower
switch is turned clockwise, and decreases air flow volume each time the blower switch is turned counterclock-
wise.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
INTAKE DOORS CONTROL
The intake doors are controlled by the recirculation switch setting, and the mode (defroster) switch setting.
MODE DOOR CONTROL
The mode door is controlled by the position of the mode switch.
DEFROSTER DOOR CONTROL
The defroster door is controlled by: Turning the defroster dial to front defroster.
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