Cooling system components (on engine), assembly overview

1 - 15 Nm

2 - Toothed belt

• Mark direction of rotation before removing
• Check for wear
• Do not kink
• Removing and installing, tensioning, refer to Toothed belt, removing, installing and tensioning 

3 - Coolant pump

• Check for ease of movement
• If damaged or leaking replace completely
• Removing and installing, refer to Coolant pump, removing and installing 

4 - O-ring

• Replace

5 - Coolant thermostat

• Checking: Heat up thermostat in water
• Opening begins approx. 87 ° C
• Ends approx. 102 ° C
• Opening lift min. 7 mm

6 - O-ring

• Replace

7 - Connecting piece

8 - To heat exchanger

• Coolant hose connection diagram, refer to Coolant hose connection diagram 

9 - O-ring

• Replace

10 - Connector

• 4-pin

11 - Engine Coolant Temperature (ECT) Sensor G62

• With Engine Coolant Temperature (ECT) Gauge Sensor G2
• For engine control module
• If necessary, release pressure in cooling system before removing
• Checking

12 - Retaining clip

• Check for secure seat

13 - Upper coolant hose

• Secured to radiator with a retaining clip
• Ensure seated tightly
• Coolant hose connection diagram, refer to Coolant hose connection diagram 

14 - Lower coolant hose

• Secured to radiator with a retaining clip
• Ensure seated tightly
• Coolant hose connection diagram, refer to Coolant hose connection diagram 

15 - Oil cooler

16 - From heat exchanger

• Coolant hose connection diagram, refer to Coolant hose connection diagram 

17 - Lower coolant line

• Coolant hose connection diagram, refer to Coolant hose connection diagram 

18 - 10 Nm

19 - Cap

• Check using cooling system tester V.A.G 1274 and adapter V.A.G 1274/9
• Test pressure 1.4 to 1.6 bar positive pressure

20 - Seal

• Replace if damaged

21 - 10 Nm

22 - Expansion tank

• Perform cooling system leakage test with cooling system tester V.A.G 1274 and adapter V.A.G 1274/8.

23 - To turbocharger

• Coolant hose connection diagram, refer to Coolant hose connection diagram 

24 - 15 Nm

25 - To top coolant hose

• Only engine code AWP with automatic transmission
• Coolant hose connection diagram, refer to Coolant hose connection diagram 

26 - After-run coolant pump V51

• Only engine code AWP with automatic transmission
• Coolant hose connection diagram, refer to Coolant hose connection diagram 
• Checking, refer to After-Run Coolant Pump V51 , checking 

27 - From turbocharger

• Only engine code AWP with automatic transmission
• Coolant hose connection diagram, refer to Coolant hose connection diagram