244001988 - E6021 DESCRIPTION OF COMPRESSOR ENGAGEMENT

Description

The left button on the climate control system control unit switches on the air cooling and dehumidification circuit, activating the air conditioning compressor.The above button enables operation of the air cooling circuit, but actual compressor activation is also dependent upon activation of:the four-stage pressure switch located on the coolant circuit that locks air conditioner activation if coolant pressure is too low or high;the engine control unit that excludes compressor operation in accordance with engine management mode; e.g. in the case of high engine temperatures or high engine load (sudden acceleration);information from the antifrost thermostat about the presence or absence of condensation on the air conditioning system pipes.The compressor supply circuit is controlled by a special relay located in the engine bay junction unit. The relay supply line is protected by a special fuse.