Mechanical Diagrams

Coolant Hose Connection Diagram

• Blue = large coolant circuit.

• Brown = heating circuit.

• Green = fuel system coolant circuit.

• Orange = Exhaust Gas Recirculation (EGR) coolant circuit.

• Red = small coolant circuit.






1 Fuel System Cooler

• Change the coolant after replacing.

2 Fuel Cooler Pump (V166)

• Not available in the US/Canadian market.

3 Check Valve

• The arrow points in the direction of flow.

4 Radiator

• Change the coolant after replacing.

5 Engine Coolant Temperature Sensor on Radiator Outlet (G83)

6 Bleed Screw

7 Coolant Thermostat

• For the Exhaust Gas Recirculation (EGR) coolant circuit.

8 Coolant Thermostat

9 EGR Cooler Pump (V400)

• In the EGR coolant circuit.

10 Generator

11 Engine Oil Cooler

12 Cylinder Head, Bank 1 (Right Side)

• Change the coolant after replacing.

13 Coolant Expansion Tank

• Replace the seal if damaged.

• Perform a cooling system leak test using the cooling system tester (V.A.G 1274) and the adapter (V.A.G 1274/8).

• Check the cap using the cooling system tester (V.A.G 1274) and the adapter (V.A.G 1274/9).

• Test pressure: 1.4 to 1.6 bar (20.4 to 23.3 psi).

14 Coolant Expansion Tank Cap

15 Engine Coolant Temperature Sensor (G62)

16 Bleed Screw

17 EGR Auxiliary Cooler

18 EGR Cooler

19 By-Pass Valve for the EGR Cooler

20 from the Heater Core

21 to the Heater Core

22 Cylinder Head, Bank 2 (Left Side)

• Change the coolant after replacing.

23 Cooling Element

• On the fuel filter.

24 Bleed Screw

25 Coolant Thermostat

• For the EGR coolant circuit.

• With the EGR motor.

26 Coolant Pump

27 Bleed Screw