17 11 100 Removing and installing/replacing coolant expansion tank (M54/M57)

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, and 2001 BMW X5. 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.

NOTE: Follow instructions for working on cooling system. Refer to 17 00 ... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

Remove front underbody protection.

Recycling:

Catch and dispose of escaping coolant.

Observe country-specific waste-disposal regulations.

Installation:

Slowly top up coolant expansion tank with coolant until marking (2) on float needle has reached height of top edge on expansion tank (maximum fill level).

Fig 1: Identifying Level On Float Needle

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Courtesy of BMW OF NORTH AMERICA, INC.

Use only recommended coolant.

NOTE: Tank marking indicates coolant level at approx. 20° C. Vent cooling system and check for leaks.17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (M54/M56) .

Open cap (1) on coolant expansion tank.

Fig 2: Locating Coolant Expansion Tank Cap

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Manual Transmissions Only:

Drain coolant from coolant expansion tank via drain plug (2).

Tightening torque, (8 N.m).

Fig 3: View Of Coolant Expansion Tank Drain Plug

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Courtesy of BMW OF NORTH AMERICA, INC.

Lever out locking clamp (1).

Detach hose (2) from connection piece.

Fig 4: Detaching Hose And Locking Clamp

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Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Pull out lock (2).

Fig 5: Disconnecting Coolant Level Sensor Plug Connection

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Courtesy of BMW OF NORTH AMERICA, INC.

When Replacing Expansion Tank:

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

Fig 6: Removing Coolant Level Sensor

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Courtesy of BMW OF NORTH AMERICA, INC.

Pull lock (1) upwards and detach coolant hose (2) from coolant expansion tank.

Fig 7: Detaching Hose From Coolant Expansion Tank

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Courtesy of BMW OF NORTH AMERICA, INC.

Pull lock (1/2) upwards and detach coolant hose.

Fig 8: Removing Coolant Hose

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Courtesy of BMW OF NORTH AMERICA, INC.

Pull coolant expansion tank first upwards and then towards rear out of retaining plate.

Withdraw coolant expansion tank from lower connection piece.

Fig 9: Removing Coolant Expansion Tank

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Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check sealing rings, replace if necessary. Do not under any circumstances coat sealing rings with antiseize agent.

Retaining lug must engage in opening in retaining plate.