Cooling System: Diagrams

Coolant Hose Connection Diagram

Risk of scalding due to hot steam and hot coolant.

• The coolant system is under pressure when the engine is warm.

• Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure in the system.

• When the engine is warm the cooling system is under pressure. If necessary release pressure before commencing repair work.

• Arrows on coolant pipes and coolant hoses must line up across from each other.

• Blue = large coolant circuit.

• Brown = heating circuit.

• Green = fuel system coolant circuit.

• Orange = exhaust gas recirculation coolant circuit.

• Red = small coolant circuit.






1 Fuel System Cooler

• Change coolant after replacing

2 Fuel Cooler Pump (V166)

3 Non-Return Valve

• The arrow points in the flow direction

4 Radiator

• Change coolant after replacing

5 Engine Coolant Temperature Sensor on Radiator (G83)

6 Bleeder Screw

7 Coolant Thermostat

• For the exhaust gas recirculation coolant circuit

8 Coolant Thermostat

9 Exhaust Gas Recirculation (EGR) Cooler Pump (V400)

• In the exhaust gas recirculation coolant circuit

10 Generator

11 Engine Oil Cooler

12 Cylinder Head Bank 1 (right)

• Change coolant after replacing

13 Coolant Reservoir

14 Coolant Reservoir Cap

• Pressure relief valve, checking => [ Pressure Relief Valve in Cap, Checking ] Testing and Inspection

15 Engine Coolant Temperature Sensor (G62)

16 Bleeder Screw

17 Auxiliary Cooler for the Exhaust Gas Recirculation (EGR)

18 Cooler for Exhaust Gas Recirculation (EGR)

19 By-Pass Valve for the Exhaust Gas Recirculation (EGR) Cooler

20 From Heat Exchanger for Heater Unit

21 To Heat Exchanger for Heater Unit

22 Cylinder Head Bank 2 (left)

• Change coolant after replacing

23 Fuel Cooler

• On the fuel filter

• Only vehicles built through 05.10

24 Bleeder Screw

• Only vehicles built through 05.10

25 Coolant Thermostat

• For the exhaust gas recirculation coolant circuit

• With Exhaust Gas Recirculation (EGR) motor (V338)

26 Coolant Pump

• Only vehicles built through 05.10

27 Bleeder Screw

• Only vehicles built through 05.10