Cooling System Components, Engine Side Assembly Overview

Cooling System Components, Engine Side Assembly Overview

Part 1

Part 2





1 Cylinder block

2 Oil cooler

3 25 Nm

4 10 Nm

5 To heater core of heater, bottom

6 Retaining clip

7 O-ring

• Replace

8 Front coolant line

9 Connecting hose

10 O-ring

• Replace

11 Coolant line

12 Connecting hose

13 Connecting piece

14 To radiator, bottom

15 5 Nm

16 O-ring

• Replace

17 Coolant thermostat

• Removing and installing => [ Coolant Thermostat ] Coolant Thermostat

• Note installation position:

Valve must be at top

• Checking (coolant thermostat installed):

=> Vehicle diagnosis, testing and information system (VAS 5051) "Guided Functions ".

• Checking (coolant thermostat removed):

Heat up thermostat in water

Starts to open: approximately 87 °C End of opening: approximately 102 °C Open distance: at least 7 mm

18 Seal

• Replace

19 25 Nm

20 Coolant thermostat housing

21 Seal

• Replace

22 Bracket for assemblies

23 10 Nm

24 Coolant pump

• With integrated silicone sealing ring for the cylinder block seal

• Removing and installing => [ Coolant Pump ] Service and Repair

25 Right coolant line

• Secured to engine mount

26 To expansion tank, bottom

Part 2

Part 1





1 Coolant connection

• Pressed in cylinder head

• Clean before installing coolant distribution housing => [ (Item 17) Coolant distribution housing ]

- If necessary, remove coolant deposits using a copper wire brush or fine sandpaper (minimum 100 grit).

• If pipe connection is worn, replace it using locking fluid (D 000600 A2).

2 Circlip

3 Seal

• Replace after removing coolant distribution housing => [ (Item 17) Coolant distribution housing ]

4 To expansion tank, top

5 Rear coolant pipe

6 10 Nm

7 Heat shielding

8 To heater core, top

9 Supply hose

10 Bypass Thermostat

• Only for vehicles with automatic transmission

• Assembly overview => [ Bypass thermostat - assembly overview ]

• Checking

11 To ATF cooler

• Only for vehicles with automatic transmission

12 To heater core, bottom

13 From ATF cooler

• Only for vehicles with automatic transmission

14 Return hose

15 Coolant line

• Bolted to coolant regulator housing => [ (Item 17) Coolant distribution housing ]

16 To coolant regulator housing

17 Coolant distribution housing

18 Supply hose

19 To top of radiator

20 Coolant hoses

• Only for Throttle Valve Control Module (J338) heated by coolant

21 Throttle valve control module (J338)

22 Engine Coolant Temperature (ECT) Sensor (G62 )

23 O-ring

• Replace

24 Retaining clip

Bypass thermostat - assembly overview





1 Spring bracket
2 Lower part of housing
Note installation position: Arrow points toward ATF cooler
3 Operating element
4 Spring
5 O-ring
6 Upper part of housing

Checking bypass thermostat

- Remove operating element - 3 - and heat in a hot water bath.

Starts to open: approximately 75 °C

Opening end: approximately 85 °C

Opens: approximately 5 mm