Air Temperature Control - Dual Zone Automatic System

Dual zone systems feature 2 rotary heating controllers, which allow individual climate control for the LH and RH sides of the cabin. Temperature selection can be made by turning the controller to the required temperature marked on the control panel. Turning either controller past the 16°C (61°F) mark will initiate the maximum cooling strategy; turning either controller past the 28°C (82°F) mark will initiate the maximum heating strategy.

NOTE: Maximum cooling or heating can only be achieved if both rotary controllers are set to the same position.

The ATC module is able to maintain constant temperatures in both sides of the cabin by monitoring the feedback from the cabin temperature sensor. Unless any manual overrides have been selected, the ATC module will automatically control the intake air source, air distribution into the cabin and blower speed to maintain the required temperatures.

Dual zone systems feature 2 temperature blend doors, allowing individual temperature output for the LH and RH sides of the cabin.

NOTE: The drivers side temperature setting has priority over the passengers side temperature setting.

The temperature blend doors are mounted on the LH side of the heater assembly and direct a proportion of cooled air from the evaporator through the heater core to provide the required temperature outputs. The ATC module controls the position of the temperature blend doors by providing LIN bus messages to the blend door stepper motors. Hall effect sensors located within the stepper motors inform the ATC module that movement of the stepper motors is taking place.