ADDITIONAL HEATER - DESCRIPTION

1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V · Automatic Air Conditioning, Manual Air Conditioning

DESCRIPTION

The vehicle climate control system is insufficient via the heater unit when the engine is cold, especially for diesel engines which take longer to warm up.

On these versions there is also an additional heating system which is activated when the engine is first running, depending on the temperature of the engine coolant.

The system consists of an additional heating device, located inside the heater unit: this device contains two resistances (PTC1 - 300 W and PTC2 - 600 W).

The operation of the resistances is controlled by the climate control system control unit which operates either just one of them or both thereby providing gradual heating with a maximum power of 900 W according to a control unit that depends on:

- the temperature of the engine coolant (about 60°C);

- the engine speed (which should be above a 700 rpm);

- the battery voltage (which should not go down below 12.2 V).

For more details

See descriptions 5040 AIR CONDITIONING CASING AND COMPONENTS

The power supply for one, two or three resistances is operated by means of two relays located on the actual heater unit:

- 1. Level: activated by the first relay (300W);

- 2. Level: activated by the second relay (600W);

- 3. Level: activated by both relays (900W)

The power supply line is protected by two MIDI maxi fuses located in a special additional fuse box at the side of the battery.