Fuel Fired Booster Heater

Fuel Fired Booster Heater

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Location of components

Location of engine coolant heater components
The information applies to the D5WZ/D5WS and B5WS engine coolant heaters.
The engine coolant heater is located in the rear right-hand part of the engine compartment.

Location Of Engine Coolant Heater Components:

Main components:
1. Engine coolant heater with radiator hose connections, exhaust system and external water pump (D5WS and B5WS)
2. Fuel pump (FP) with fuel hoses / pipes to and from the fuel pump (FP). This is located in the rear axle behind the fuel tank
3. Fuel hoses / pipes with suction hose on the fuel tank unit, suction and pressure hoses to and from the fuel pump (FP) above the fuel tank (2), as well as pressure hoses / pipes under the vehicle, parallel with other fuel hoses / pipes, up to the heater unit.

Components engine coolant heater

Components Engine Coolant Heater (Part 1):

Components Engine Coolant Heater (Part 2):

1. Combustion preheater module (CPM)
2. Fan shroud
3. Fan motor
4. Heat exchanger together with housing
5. Water temperature sensor and overheat protection thermostat together cable harness
6. Combustion chamber
7. Flame sensor
8. Glow plugs.