HEATER - DESCRIPTION

1.8 T.SPARK, 2.0 JTS, 1.9 JTD 16V

Description

The vehicle climate control system is achieved through the duct/distributor unit and heater.

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 right button switches the heated rear windscreen on and lights up the LED.

  See E3030 HEATED REAR WINDSCREEN AND DOOR MIRROR DEFROSTING

• If the centre button is pressed it switches on the air recirculation function; the LED comes on when the button is pressed. If the button is not pressed, "dynamic" air from the outside flows through.

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

• air distribution at the vents;
• fan speed (continuous variation);
• air recirculation engagement;

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.

For more details

Characteristic of working principle 5020 HEATER

1.9 JTD 16V

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.