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Coolant pump (B204i/E)

Coolant pump (B204i/E)

To remove



1. Unscrew the drain plug and drain the coolant. Remove the expansion tank pressure cap to speed this up.

2. Remove the air cleaner.

3. Detach the intake hose and plug the pipe (turbo).

4. Remove the bypass hose and the delivery pipe between the charge air cooler and throttle body (turbo).

5. Relieve the belt tensioner of tension using a ratchet handle extension and insert a 6 mm drill bit or the like in the hole, see illustration.

6. Remove the power steering pump with bracket and suspend it from the radiator crossmember.

7. Detach the coolant hoses and pipes from the pump.


8. Undo the screw securing the coolant pipe in the front left corner of the engine.

9. Remove the throttle body hose from the coolant pipe and undo the thermostat housing bolts. Move the pipes aside.

10. Remove the solenoid valve and move it to one side (turbo).


11. Remove the coolant pump.

12. Remove the sleeve with O-rings and unbolt the coolant pump from the pump housing.


To fit



1. Clean the mating surfaces and bolt the coolant pump to the pump housing.

2. Lubricate the O-rings with non-acidic vaseline and fit the sleeve together with the pump.

3. Refit the solenoid valve (turbo).

4. Attach the coolant hose to the throttle body and refit the thermostat housing bolts.


5. Fit the coolant pipe retaining bolt in the front left corner of the engine.

6. Connect the coolant hoses and coolant pipes to the coolant pump.

7. Refit the power steering pump with bracket and fit the belt.


8. Relieve the belt tensioner with a ratchet handle extension and remove the drill bit.

9. Fit the delivery pipe between the charge air cooler and throttle body and refit the bypass hose (turbo).

10. Refit the intake hose (turbo) and fit the air cleaner.

11. Make sure that the radiator drain plug is tightened. Fill up with coolant and check the system for leaks.

12. Fill up and bleed the system as follows:

Note

A/C and ACC must be OFF.


• Fill the system up to the MAX level, fit the pressure cap, start the engine and warm it up at varying rpm until the radiator fan starts.

• Switch off the engine and top up as necessary to the MAX level.