Compressor engagement

Compressor engagement

When pressed, the button illustrated enables COMPRESSOR OPERATION (air cooling circuit); when the button is released operation is disengaged.

However actual engagement of the compressor depends on the following conditions:

• outside temperature below 5°C: (disengagement below 4°C and re-engagement above 6°C);
• temperature detected by the antifrost sensor: (disengagement below 3.5°C and re-engagement above 5°C).

You are reminded that the compressor may also be disengaged by the four-level pressure switch or by the engine control unit. This logic depends on the different engine management control units (see ELECTRIC - ELECTRONIC DIAGNOSIS).

SYSTEM COMPONENTS

ELECTRONIC CONTROL UNIT

The electronic control unit manages automatic operation of the system controlling the thermodynamic parameters in order to provide the climatic comfort (temperature and humidity) required by the occupants of the car.

It is on the right side of the duct-distributor unit and access to it is easily gained from the passenger compartment.

OUTSIDE AIR TEMPERATURE SENSOR

This is on the right wing mirror.

It is an NTC sensor - resistance that lowers with the temperature (R at 25°C = 10 kOhm), with operating range from -30°C to +50°C.