Air Temperature Control - Single Zone Manual System

Cabin temperature selection is made by turning the LH rotary controller to the required position. Turning the controller counter clockwise will lower the temperature of the air exiting the heater assembly; turning the controller clockwise will raise the temperature of the air exiting the heater assembly.

Maximum heating and cooling is represented on the control panel by a red and blue dot respectively. When either maximum heating or cooling is selected, the 'comfort' algorithm in the ATC module will adopt a suitable strategy for air source, air distribution and blower speed to maintain maximum heating or cooling within the cabin.

The ATC module adjusts the temperature of the air exiting the heater assembly by moving the position of the temperature blend door. The temperature blend door directs a proportion of cooled air from the evaporator through the heater core to produce the required temperature output. The ATC module adjusts the position of the temperature blend door by providing LIN bus messages to the blend door stepper motor. A Hall effect sensor located within the stepper motor informs the ATC module that movement of the stepper motor is taking place.