Cooling System

Coolant Hose Connection Diagram

Risk of scalding due to hot steam and hot coolant.

• When the engine is warm the cooling system is under pressure.

• Reduce pressure by covering coolant reservoir cap with a cloth and carefully open.

• Secure all hose connections with hose clamps appropriate for the model.

• Arrows on coolant pipes and ends of coolant hoses must align when installing.






1 Radiator

• Removal and installation, refer to => [ Radiator ] Radiator

• Change coolant after replacing

2 Non-Return Valve

3 After-Run Coolant Pump (V51)

• Removal and installation, refer to => [ After-Run Coolant Pump ] Service and Repair

4 Oil Cooler

• Change coolant after replacing

5 Coolant Pump

• Removal and installation, refer to => [ Coolant Pump ] Service and Repair

6 Cylinder Head and Cylinder Block

• Change coolant after replacing

7 Coolant Reservoir

8 Coolant Reservoir Cap

• With check-valve

• Pressure relief valve, checking => [ Pressure relief valve in cap,
checking ] Testing and Inspection

9 Heater Core

• Change coolant after replacing

10 Coolant Thermostat

• With connecting piece, removing and installing, refer to => [ Connecting Piece with Coolant Thermostat ] Connecting Piece with Coolant Thermostat

• Checking, refer to => [ Thermostat, Checking ] Testing and Inspection

11 Non-Return Valve

• Only on vehicles with direct shift automatic transmission (DSG)

12 Transmission Oil Cooler

• Change coolant after replacing

13 Auxiliary Radiator

• Depending on vehicle equipment