Cooling system components, engine side

1 - Pressure cap

• Check with cooling system tester VAG 1274 and adapter VAG 1274/9
• Test pressure 1.4-1.6 bar

2 - O-Ring

• Replace if damaged

3 - Coolant expansion tank

• Check for leaks in cooling system using cooling system tester VAG 1274 and adapter VAG 1274/8

4 - 10 Nm

5 - Upper coolant pipe

• Clipped into the bulkhead
• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

6 - To heat exchanger

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

7 - Throttle valve control module J338

• Heated by coolant

8 - To upper coolant hose

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

9 - To upper radiator

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

10 - Gasket

• Always replace

11 - To lower radiator

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

12 - Thermostat housing

• Disassembling and assembling, refer to Thermostat housing, disassembling and assembling 

13 - After-run coolant pump V51

• Check, refer to After-Run Coolant pump V51 , checking 

14 - From heat exchanger

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

15 - 25 Nm

16 - Oil cooler

• Coat contact surfaces outside of sealing ring with sealant AMV 188 001 02 
• Make sure free movement among surrounding components
• See Note, refer to Lubrication system components, removing and installing 

17 - Screw plug

18 - Coolant pipe

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram 

19 - Coolant pump

• Observe installed position
• Check for smooth running
• Replace completely if damaged or if leaking
• Removing and installing, refer to Coolant pump, removing and installing 

20 - 15 Nm

21 - Pulley

• For coolant pump

22 - 25 Nm

23 - To Y-branch of heat exchanger/coolant pump

• Coolant hoses, connection diagram, refer to Coolant hoses, connection diagram