2889483 - E6021 COMPRESSOR ENGAGEMENT - Description (Automatic Air Conditioning, Euro 3)

Description

The right button in the climate control control panel in the centre of the dashboard switches on the air cooling and dehumidifying circuit, activating the air conditioning compressor, according to the complex control logic managed by the climate control system control unit.  Characteristic of working principle 5040  AIR CONDITIONING CASING AND COMPONENTS

The above mentioned control unit enables the operation of the air cooling circuit; but the actual switching on of the compressor also depends on the intervention of:

• the 3 stage pressure switch, located in the refrigerant circuit, which stops the air conditioning being switched on if the pressure of the fluid is too low or too high;
• the engine control unit which, according to the engine management logic, excludes the operation of the compressor, for example in the case of high engine temperatures or in the case of high engine loads (sharp acceleration).

The cooling circuit is also controlled by engaging the 'MAX DEF' rapid demisting function (last position of the distribution knob)  Characteristic of working principle 5040  AIR CONDITIONING CASING AND COMPONENTSThe compressor supply circuit is controlled by a specific relay, located in the engine compartment, in the relay and fuse box; the relay supply line is protected by a specific fuse in the fuse box.