3023562 - E6021 COMPRESSOR ENGAGEMENT - Description

Description

When required, the climate control system ECU automatically activates the cooling circuit and dehumidifies the air by operating the air conditioner compressor.The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on. The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy: for more details  Characteristic of working principle 5040  AIR CONDITIONING CASING AND COMPONENTS . The compressor can also be switched off by the intervention of the four stage pressure switch or by the engine control unit  Characteristic of working principle 1060  DIESEL FUEL INJECTION . The compressor is controlled by means of a special relay located in the engine bay control unit. the supply line is protected by a specific fuse, again in the engine bay control unit.