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 16 other vehicles, including the 2006 BMW 325Ci, 2005 BMW 325xi, 2005 BMW 325i, 2005 BMW 325Ci, and 2004 BMW 325xi. 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, refer to INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

Remove intake filter housing. See 13 71 000 REMOVE AND INSTALLING INTAKE FILTER HOUSING (M52TU, M54, M56)

Remove front underbody protection. See 51 11 000 REMOVING AND INSTALLING COMPLETE FRONT BUMPER (FROM 10/01)

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: Pulling Out Lock

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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: Detaching Coolant Hose From Radiator/Coolant Expansion Tank

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

Fig 4: Detaching Coolant Hose From Coolant Expansion Tank

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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: Identifying Retaining Lug Engage In Opening In Retaining Plate

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