Air Intake Control

The source of intake air is automatically controlled unless overridden by pressing the air recirculation switch located below the TSD. Under automatic control, the automatic temperature control (ATC) module determines the required position of the recirculation door from its 'comfort' algorithm and, if fitted, the pollution sensor.

The recirculation door is operated by an electric motor. The automatic temperature control (ATC) module provides analogue signals to the motor along a hardwired connection. A potentiometer in the motor supplies the automatic temperature control (ATC) module with a position feedback signal for closed loop control.