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.

• When the engine is warm the cooling system is under pressure. If necessary release pressure before commencing repair work.

• Secure all hose connections using hose clamps appropriate for the model type, refer to the Parts Catalog.

• Hose clip pliers (V.A.G 1921) or spring type clip pliers (VAS 5024 A) are recommended for installing spring-type clamps.

• Always replace gaskets and seals.

• Arrows on coolant pipes and coolant hoses must line up across from each other.

Vehicles with Manual Transmission

• The - arrows - point in the coolant flow direction.






1 Radiator

2 After-Run Coolant Pump (V51)

3 Coolant Pump

4 Coolant Thermostat

5 Engine Oil Cooler

6 Cylinder Head and Cylinder Block

7 Turbocharger

8 Coolant Reservoir

• With cap

• Pressure relief valve in cap, checking, refer to => [ Cooling System, Checking for Leaks ] Testing and Inspection

9 To Auxiliary Heater

• If applicable

10 From the Auxiliary Heater

• If applicable

11 Heat Exchanger for Heater Unit

12 Coolant Connection

Vehicles with a S-Tronic Transmission

• The - arrows - point in the coolant flow direction.






1 Radiator

2 After-Run Coolant Pump (V51)

3 Coolant Pump

4 Coolant Thermostat

5 Engine Oil Cooler

6 Cylinder Head and Cylinder Block

7 Turbocharger

8 Coolant Reservoir

• With cap

• Pressure relief valve in cap, checking, refer to => [ Cooling System, Checking for Leaks ] Testing and Inspection

9 To Auxiliary Heater

• If applicable

10 From the Auxiliary Heater

• If applicable

11 Heat Exchanger for Heater Unit

12 Transmission Fluid Cooler

13 Coolant Connection

14 Coolant Thermostat for the Transmission Fluid Cooler