A/C Compressor: i6

i6 vehicles are fitted with a Zexel-Valeo KC-88 variable displacement A/C compressor. Compressor displacement is controlled by the Engine Control Module (ECM) based on current evaporator temperature and target evaporator temperature signals received from the ATC module. From these values the ECM calculates the required compressor displacement and provides a Pulse Width Modulated (PWM) signal to the compressor solenoid valve. The compressor solenoid valve is mounted on the rear of the compressor and interprets the PWM signal as a displacement value and alters the position of the internal swash plate accordingly. See CONTROL COMPONENTS .

The ECM will also reduce the displacement of the A/C compressor to its minimum level if 'full throttle' or automatic transmission 'kick down' is requested. This feature is not present on Gulf specification vehicles.

Compressor clutch engagement is controlled by the ECM. See CONTROL COMPONENTS .