Cooling System

Coolant Hose Connection Diagram






1 Expansion Tank

2 Non-Return Valve

• Note the installed position.

• Arrow on the check valve points in direction of flow

3 Non-Return Valve

• Integrated into the coolant hose, not visible from outside

4 Heat Exchanger for Heater Unit

• Replace coolant after replacing

5 Heater Coolant Shut-Off Valve (N279)

• Only vehicles with optional equipment

6 Coolant Thermostat Housing

7 Transmission Oil Cooler

8 Lower Coolant Hose

9 Upper Coolant Hose

10 Radiator

11 Engine Oil Cooler

• For engine oil

12 After-Run Coolant Pump (V51)

13 Cylinder Block

14 Coolant Pump

15 Cylinder Head

16 Auxiliary Heater

• Not available on US vehicles.