COMPRESSOR ENGAGEMENT - Description

1.3 JTD

Description

The centre button in the climate control control panel 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 fan linear sensor, 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);
• the frost thermostat sensor, near the evaporator, which stops the air conditioning being switched on if the temperature of the evaporator is too low;

1.3 JTD · Two-zone climate control system

Description

The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on.

The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy.

The compressor can also be switched off by the intervention of the fan linear sensor or the engine management control unit.

1.3 JTD

Description

For more details Characteristic of working principle 5040 AIR CONDITIONING CASING AND COMPONENTS.

With the compressor switched on, the fan is operated at the first speed by means of a special relay located inside the unit.

The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.

The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.

The supply for the controls comes via a line controlled by the ignition and protected by a fuse in the underdashboard control unit.

1.2 8v, 1.2 16v, 1.4 16v

Description

The centre button in the climate control control panel 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 fan linear sensor, 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).
• the frost thermostat sensor, near the evaporator, which stops the air conditioning being switched on if the temperature of the evaporator is too low;

1.2 8v, 1.2 16v, 1.4 16v · Two-zone climate control system

Description

The appropriate button in the climate control control panel enables operation of the air cooling circuit; when the button is pressed the LED comes on.

The above button enables the operation of the air cooling circuit; the actual switching on of the compressor, however, also depends on the climate control system ECU operating strategy.

The compressor can also be switched off by the intervention of the fan linear sensor or the engine management control unit.

1.2 8v, 1.2 16v, 1.4 16v

Description

For more details Characteristic of working principle 5040 AIR CONDITIONING CASING AND COMPONENTS.

With the compressor switched on, the fan is operated at the first speed by means of a special relay located inside the unit.

The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.

The fan is supplied by a line protected by a specific fuse and operated by a special relay, in the engine compartment junction unit.

The supply for the controls comes via a line controlled by the ignition and protected by a fuse in the underdashboard control unit.