Ford Workshop Service and Repair Manuals

For the Scandinavian market, vehicles with diesel engines are fitted with a fuel fired booster heater, because at low ambient temperatures there is insufficient waste heat available for the heater.

For this reason a booster heater is installed to increase the coolant temperature so that the discharge air in the heater core housing is heated up sufficiently.

The highest output of the booster heater is 5 kW and the lowest 2.2 kW.

A fuel pump attached to the booster heater transfers diesel from the engine fuel line and pumps it into the evaporator section of the combustion chamber.

An additional pressure regulating valve is installed before the fuel pump to reduce the fuel pressure below 0.2 bar.

The exhaust gases are discharged into the outside air by means of a separate exhaust system.

An amount of smoke during the start of the fuel fired heater is typical and a part of the normal combustion process.

The system is automatically activated when the engine is running (signal D+ from the generator is active) and when the ambient temperature is lower than 5°C and the coolant temperature falls below 75°C. The system is controlling the coolant temperature during the complete drive.

The system is not activated (or deactivated) automatically if the coolant temperature reaches 85°C and in the event of a malfunction.

The system shuts down if:

• after a second starting attempt (after an interval of 90 seconds) there is no ignition,
• the flame is extinguished during operation and a new starting attempt fails,
• overheating triggers the overheating sensor,
• the voltage exceeds or falls below the value specified, the glow plug or the lead to the injection pump is inoperative,
• the air blower is blocked or inoperative.