Coolant Pump/Thermostat Overview

Coolant Pump/Thermostat Overview

• Coolant hose connection diagram. Refer to => [ Coolant Hose Connection Diagram ] [1][2]Cooling System.

• Hoses are secured with spring type clamps. In cases of repair only use spring type clamps.

• Hose clip pliers (VAS 6340) or (VAS 6362) are recommended for installing spring clamps.

• While installing, route the coolant hoses free of tension and without them coming into contact with other components.

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

• Always replace gaskets and seals.






1 to the Expansion Tank Upper Connection

2 Rear Coolant Pipe

3 Nut

• 20 Nm

4 from the Heater Core

5 to the Heater Core

6 Coolant Pipe

7 Bolt

• 10 Nm

8 from the Transmission Oil Cooler

9 Coolant Pipe, Side, Top

10 Bolt

• 10 Nm

11 Engine Coolant Temperature Sensor (G62)

• If necessary release the pressure in the cooling system before removing.

12 O-ring

• Always replace.

13 Clip

• Make sure it is secure.

14 Bolt

• 10 Nm

15 to the Radiator Upper Connection

16 from the Auxiliary Cooler

• If installed.

17 to the Auxiliary Cooler

• If installed.

18 from the Radiator Lower Connection

19 Check Valve

• Pay attention to the installed position.

• The arrow on the check valve points in the direction of flow.

20 Coolant Pipe, Side, Bottom

21 Bolt

• 25 Nm

22 to the Transmission Oil Cooler

• If installed.

23 Recirculation Pump (V55)

• Attached to the accessory bracket.

• For removal of the accessory bracket, refer to => [ Accessory Bracket ] Service and Repair.

• Component location of the recirculation pump. Refer to => [ Component Location of the Recirculation Pump: ].

24 Bolt

• 8 Nm

25 Coolant Thermostat

• Starts to open at 80 °C (176 °F).

• Removing and installing, refer to => [ Coolant Thermostat ] Coolant Thermostat.

26 Coolant Pipe

• With the coolant thermostat housing.

27 Seal

• Always replace.

28 Bolt

• 8 Nm

29 Pulley

• For the coolant pump.

• Removing and installing, refer to => [ Coolant Pump ] Coolant Pump.

30 Bolt

• 20 Nm

31 Coolant Pump

• Check for ease of movement.

• Removing and installing, refer to => [ Coolant Pump ] Coolant Pump.

32 Gasket

• Always replace.

33 Water Connection

34 Bolt

• 10 Nm

35 from the Expansion Tank Lower Connection

Component Location of the Recirculation Pump:





The recirculation pump - arrow - is attached to the accessory bracket.

- Remove the accessory bracket from the cylinder block. Refer to => [ Accessory Bracket ] Service and Repair.