When conditions require, the climate control system control unit switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The special button in the climate control system control unit panel enables the operation of the air refrigeration circuit, but the effective engagement of the compressor depends on the actual climate control system control unit logic itself.The compressor can also be switched off by the signal from the linear sensor, detected by the engine management control unit, for the engine coolant pressure.The compressor is controlled by means of a special relay located in the engine compartment junction unit; the supply line is protected by a special fuse, also located inside the engine compartment junction unit.