Cooling System

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.

• Secure all hose connections with hose clamps of the same type as those equipped by the factory. Refer to the Parts Catalog.

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

Vehicles without Auxiliary Heater

• The arrows show the coolant flow direction.






1 Radiator

• Change coolant after replacing

2 Coolant Pump

3 Engine Coolant Temperature Sensor (G62)

4 Coolant Thermostat

5 Coolant Pump (V50)

• Activated by the recirculation pump relay (J160)

6 Cylinder Head and Cylinder Block

• Change coolant after replacing

7 Coolant Switch-Off Valve

• Is controlled by the climatronic refrigerant shut-off valve (N422)

• The climatronic refrigerant shut-off valve is controlled by the climatronic control module (J255).

8 Bleeder Hole

9 Heat Exchanger for Heater Unit

• Change coolant after replacing

10 Coolant Reservoir Cap

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

11 Coolant Reservoir

12 Engine Oil Cooler

• Change coolant after replacing

13 After-Run Coolant Pump (V51)

• Vehicles for countries with warm climates

14 Non-Return Valve

15 Non-Return Valve