223003259 - E6021 COMPRESSOR ENGAGEMENT - DESCRIPTION (BIPOWER, MY 2005)

The compressor on button is incorporated in the knob that selects the fan speed.The above button enables operation of the air cooling circuit, but actual compressor activation is also dependent upon activation of:- the 4 stage pressure switch, located in the refrigerant circuit, which stops the engagement of the air conditioning if the pressure of the refrigerant is too low or too high;- the engine management control unit which, depending on the engine management logic, excludes the operation of the compressor, for example if the engine temperature is high or in the case of high engine loads (sharp acceleration).The enablement of the vehicle interior fan speed adjustment is also required (at least in position 1) and the frost thermostat.    See E6020 AIR CONDITIONINGThe compressor supply circuit is controlled by a specific relay, located in the engine compartment junction unit; the supply line for the relay is protected by a special fuse.