223003155 - E6021 COMPRESSOR ENGAGEMENT - DESCRIPTION

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.

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

• the 4 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).

In addition the enablement is required for the vehicle interior fan adjustment knob (at least in position 1) and the frost thermostat    See E6020 AIR CONDITIONING.The compressor supply circuit is controlled by a specific relay, located in the engine compartment in the junction unit; the relay supply line is protected by a specific fuse.