Auxiliary Climate Control System

An auxiliary climate control system is standard equipment. The auxiliary climate control system operation is determined by the settings on the front or rear auxiliary climate control assembly. The auxiliary climate control assemblies include a blower motor switch, temperature control switch and air distribution mode switch, none of which can be individually serviced.

The auxiliary blower motor is operational regardless of the DATC system setting. The auxiliary system air can be cooled below internal vehicle temperature only when A/C compressor operation has been requested by the settings of the DATC module. The auxiliary system air can be heated at any time.

The front auxiliary climate control assembly:

• blower motor switch controls the auxiliary blower motor speed. The blower motor speed can be set to OFF, LO, MED LO, or MED HI. When the front auxiliary blower motor switch is set to REAR, all control of the auxiliary climate control system functions are then transferred to the rear auxiliary climate control assembly.
• air distribution mode switch toggles airflow between the overhead vents and the floor vent by outputting signals to the auxiliary air distribution door actuator. This positions the auxiliary air distribution door in all blower motor switch positions except REAR. Back-lit icons on the front climate control display indicate the source of the auxiliary system airflow.
• temperature control switch is a potentiometer that outputs a variable voltage to the auxiliary temperature blend door actuator to set the position of the auxiliary temperature blend door in all blower motor switch positions except REAR. The temperature of the auxiliary system air may be affected by the DATC module settings. When A/C compressor operation has not been initiated (A/C compressor commanded on) by the DATC module, the auxiliary climate control system cannot cool the air below that of the internal vehicle temperature.

The rear auxiliary climate control assembly:

• blower motor switch controls the auxiliary blower motor speed only when the front auxiliary climate control assembly blower motor switch is set to REAR. The blower motor speed can be set to OFF, LO, MED LO, MED HI, or HI.
• air distribution mode switch toggles airflow between the overhead vents and the floor vent by outputting signals to the auxiliary air distribution door actuator. This positions the auxiliary air distribution door only when the front auxiliary climate control assembly blower motor switch is set to REAR. Back-lit icons on the rear climate control display indicate the source of the auxiliary system airflow.
• temperature control switch is a potentiometer that outputs a variable voltage to the auxiliary temperature blend door actuator to set the position of the auxiliary temperature blend door only when the front auxiliary climate control assembly blower motor switch is set to REAR. The temperature of the auxiliary system air may be affected by the DATC module settings. When A/C compressor operation has not been initiated (A/C compressor commanded on) by the DATC module, the auxiliary climate control system cannot cool the air below that of the internal vehicle temperature.