Mechanics

REAR CLIMATE CONTROL SYSTEM

2003 Cadillac Escalade • V8 AWD Automatic • 200 miles

I have a 2003 cadillac escalade and I am having difficulty with the rear climate control system. The driver overhead contol is set to auto. The rear heated seats work, but when I go to increase the temperature in the rear on the panel, it doesnt increase, and when I try to turn up the fan at the fan contoller on the rear, it doesnt increase, it just reads OFF? What can I do?
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Jherl
February 1, 2011.




If the front panel is set to auto, I believe that panel is in control. Isn't there an AUX position that can be selected on the front panel? This will relinquish control to the auxiliary(or rear) panel. Here is what information I found.

Auxiliary Heating and A/C Operation
There are 2 separate controls for the auxiliary HVAC system. There is the front auxiliary HVAC control assembly and the rear seat audio control module. These 2 components provide passenger inputs to the auxiliary HVAC control module. The auxiliary HVAC control module, which is mounted on the auxiliary HVAC case, controls all functions of the auxiliary HVAC system. If the front auxiliary HVAC control assembly is in any other position than OFF or AUX, then the auxiliary HVAC control module will use inputs from the front auxiliary HVAC control assembly. If the system is in the AUX position then the auxiliary HVAC control module will use inputs from the rear seat audio control module. If the front auxiliary blower motor switch is in the OFF position, then the auxiliary HVAC control module does not respond to input. The auxiliary HVAC control module can not request A/C operation from the PCM.

Placing the auxiliary air temperature switch to the warmest position diverts most of the airflow through the heater core, which increases the outlet air temperature. Placing the auxiliary air temperature switch to the coolest position diverts most of the airflow around the heater core, which decreases the outlet air temperature.
Auxiliary automatic operation.
In automatic operation, the auxiliary HVAC control module will maintain the comfort level inside of the vehicle by controlling the auxiliary blower motor, the auxiliary air temperature actuator and the auxiliary mode actuator.

To place the auxiliary HVAC system in Automatic mode, the following is required: The auxiliary blower motor switch on the front HVAC control assembly must be in the Auto position.
The auxiliary mode switch on the front HVAC control assembly must be in the Auto position.
The auxiliary air temperature switch must be in any other position other than full hot or full cold position.
Once the desired temperature is reached, the auxiliary blower motor, auxiliary mode and auxiliary temperature actuator will automatically be adjusted to maintain the temperature selected. The auxiliary HVAC control module performs the following functions to maintain the desired air temperature: Monitor the following sensors: Inside Air Temperature Sensor-Auxiliary
Upper Air Temperature Sensor-Auxiliary
Lower Air Temperature Sensor-Auxiliary
Regulate auxiliary blower motor speed
Position the auxiliary air temperature actuator
Position the auxiliary mode actuator

Factoryjack
Feb 2, 2011.


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