ADDITIONAL HEATER DESCRIPTION

2.0 16V JTD, 2.2 16V JTD

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 three resistances (PTC).

The operation of the resistances is controlled by a specific control unit, connected to the engine management control unit, which operates either just one, or two or three, thereby providing gradual heating.

This control logic depends on:

• the temperature of the engine coolant;
• the electrical power level available (the battery voltage is controlled);
• the engine speed (which should be above a preset value).