AIR CONDITIONER - DESCRIPTION

1.8 T.SPARK, 2.0 JTS, 1.9 JTD 16V · Manual Air Conditioning

Description

The vehicle climate control system is achieved through the duct/distributor unit and heater. The air conditioning system integrates the heater with the function of producing cold and dehumidified air achieved by switching on the compressor and the cooling system.

The climate is controlled by means of three control knobs on the facia:

• the left knob controls the hot and cold air mixing flap;
• the right knob controls the opening of the flaps that regulate the distribution of air flows;
• the centre knob regulates the air ventilation at four different speeds;

The recirculation button and the button for switching the air conditioning compressor on are located in the lower part of the controls.

A special control unit manages the operation of the system by controlling:

• air distribution at the vents;
• fan speed (continuous variation);
• compressor engagement (air refrigeration circuit);
• air recirculation engagement;
• the MAX-DEF rapid defrosting function (which consists of a collection of measures which make it possible to demist both the windscreen and the rearscreen quickly);

The control unit sets the above parameters so that temperature of the passenger compartment is adjusted to the desired temperature.

Depending on the set requirements, the control unit establishes the inlet speed for the air into the passenger compartment via the engine fan and the temperature by means of a mixture actuator; the distribution of the flows is also set by another actuator and, lastly, the interior air/exterior air recirculation function by a final actuator.

If the conditions require, the control unit also switches on the air cooling and dehumidification circuit, activating the air conditioning compressor

See E6021 COMPRESSOR ENGAGEMENT

For more details

Characteristic of working principle 5040 AIR CONDITIONING CASING AND COMPONENTS

The vehicle speed signal arrives via the CAN and is used by the climate control system control unit to filter the outside temperature and compensate for the ventilation and dynamic air intake depending on the speed of the vehicle.

The Body Computer continuously acquires the "battery voltage" signal to compare it with a limit figure: if the battery voltage measured is below the level, it intervenes via the CAN sending a signal to disable a series of loads: including deactivating the fan operation.

The climate control system control unit receives a power supply from an ignition-operated line protected by a fuse in the junction unit under the dashboard; the fan receives a supply from a line protected by a specific fuse in the engine compartment junction unit.