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Thermostat (B204i/E)

Thermostat (B204i/E)

To remove



1. Open the drain plug and drain the coolant. Unscrew the expansion tank filler cap to speed this up.

2. Remove the cover over the throttle body (turbo).

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

4. Undo the bolt securing the coolant pipe to the coolant pump.

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

6. Detach the throttle body preheating hose and remove the bolts securing the coolant pipe to the thermostat housing cap.


7. Remove the thermostat housing cap and extract the thermostat.


To fit



1. Clean the sealing surfaces and fit the thermostat and thermostat housing cap.

2. Fit the coolant pipe back on the coolant pump but do not tighten the bolt.


3. Fit the bolt in the corner of the engine and fit the coolant pipe retaining bolts to the thermostat housing cap but do not tighten them.

4. When the pipe is fixed at all securing points the bolts can be tightened.

5. Attach the throttle body preheating hose.

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

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

8. 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.