Cooling System

Coolant Hose Connection Diagrams

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.

• Secure all hose connections with hose clamps appropriate for the model, refer to the electronic parts catalog ETKA.

• The arrows on the coolant pipes and ends of coolant hoses must align.

• Blue = large coolant circuit.

• Red = small coolant circuit.

• Orange = coolant circuit for ATF cooling.

• Brown = heating circuit.






1 Radiator

• Change coolant after replacing

2 Engine Temperature Control Temperature Sensor (G694)

3 Generator

4 Engine Oil Cooler

• Change coolant after replacing

5 Cylinder Head

• Cylinder bank 1 (right)

• Change coolant after replacing

6 Coolant Temperature Sensor (G62)

7 Coolant Recirculation Pump (V50)

8 Bleeder Screw

9 Coolant Switch-Off Valve (N82)

10 Front Heater Unit Heat Exchanger

• Change coolant after replacing

11 Rear Heater Unit Heat Exchanger

• Change coolant after replacing

12 Transmission Coolant Valve (N488)

13 Crankcase Ventilation

14 ATF Cooler

15 Non-Return Valve

16 Cap

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

17 Coolant Reservoir

18 Cylinder Head Coolant Valve (N489)

19 Cylinder Head

• Cylinder bank 2 (left)

• Change Coolant after replacing

20 Coolant Pump

21 Map Controlled Engine Cooling Thermostat (F265)

22 After-Run Coolant Pump (V51)

23 Transmission Fluid Cooling Valve (N509)