17 11 100 Removing and installing/replacing coolant expansion tank (M52TU, M54, N42, N40)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 BMW 330xi, 2005 BMW 330i, 2005 BMW 330Ci, 2004 BMW 330xi, and 2004 BMW 330i. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Danger of scalding!
Only perform this work after engine has cooled down.

Follow instructions for working on cooling system. See 17 00... Instructions for working on cooling system.

Remove intake filter housing. See 13 71 000 REMOVE AND INSTALLING INTAKE FILTER HOUSING (M52TU, M54)

Remove front underbody protection.

Drain coolant from radiator. See 17 00 005 Draining and adding coolant (M54, M56)

Unfasten plug connection (1) and disconnect.

Pull out lock (2).

Fig 1: Unfastening Plug Connection

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When replacing coolant expansion tank:

Unlock coolant level sensor (1) by turning and pull out of coolant expansion tank.

Fig 2: Unlocking Coolant Level Sensor

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Pull locks (1 and 2) upwards and detach coolant hose from radiator/coolant expansion tank.

Fig 3: Pulling Locks Upwards

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Pull lock (1) upwards and detach coolant hose from coolant expansion tank.

Fig 4: Pulling Lock Upwards

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Pull coolant expansion tank a little out of retaining plate and lower connection piece. Then tilt expansion tank to rear and remove.

Installation:

Check O-rings. Under no circumstances coat O-rings with antiseize agent prior to installation.

Retaining lug must engage in opening in retaining plate.

Fig 5: Checking O-Rings

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