Cooling System

Coolant Hose Connection Diagram

• The arrows show the coolant flow direction.





1 Radiator

• Change coolant after replacing

2 Coolant pump

3 Engine Coolant Temperature (ECT) 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 Auxiliary Heater Exhaust Gas Sensor (N422)

• The Auxiliary Heater Exhaust Gas Sensor (N422) is controlled by the Climatronic Control Module (J255).

8 Bleeder hole

9 Heater core

• 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 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