3234709 - E6021 COMPRESSOR ENGAGEMENT - Description (Manual Air Conditioning)

Description

When required, the climate control system ECU automatically activates the cooling circuit and dehumidifies the air by operating the air conditioner compressor.The left button in the climate control control panel enables the operation of the air refrigeration circuit; when the button is pressed the LED comes on.The operation of the air cooling circuit is also enabled automatically (without pressing the button) when the ignition key is turned to the ON position if the temperature of the air at the vents is below the temperature of the outside air.this button enables the operation of the air cooling circuit; but the actual switching on of the compressor is excluded at low external temperatures. For more details  Characteristic of working principle 5040  AIR CONDITIONING CASING AND COMPONENTS . The compressor may also be deactivated by the 4-stage pressure switch or the engine management unit according to the engine management software, which is different for each engine version  Characteristic of working principle 1056  PETROL INJECTION SYSTEM . The compressor supply circuit is controlled by a specific relay, located in the engine bay close to the battery.The relay contact line is protected by a special fuse and the exclusion relay controlled by the ignition, located in the junction unit.The energizing line is protected by the fuse which protects other supplies controlled by the ignition.