17 11 100 Removing and installing or replacing coolant expansion tank

Integrated expansion tank 

Drain off coolant down to lower edge of expansion tank only, refer to 17 00 005 DRAINING AND TOPPING UP COOLANT .

Release vent plug (1).

Release retaining screws (2).

Remove upper section.

Fig 1: Releasing Vent Plug

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Pull out expansion tank in upward direction.

Installation 

Replace sealing rings.

Fig 2: Replacing Sealing Rings

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M62 

Remove cover from air cleaner. See 13 72 001 REPLACING AIR FILTER INSERT (M60, M62)

Unscrew and remove expansion tank cap.

Unscrew and completely remove vent screw.

Fig 3: Unscrewing Expansion Tank Cap

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Unscrew and remove splash guard.

Cars with automatic transmissions:

Turn hose plug (1) to left and detach towards bottom.

Cars with manual transmission:

Remove drain plug at bottom of radiator.

Drain off and catch coolant.

Fig 4: Turning Hose Plug

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Recycling 

Catch and dispose of drained coolant. Observe country-specific waste-disposal regulations.

Remove connector from level sensor.

Fig 5: Removing Connector From Level Sensor

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Disconnect expansion hose.

Fig 6: Disconnecting Expansion Hose

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Unclip retainer.

Fig 7: Uncoupling Retainer

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Pull expansion tank backwards and remove vent hose.

Fig 8: Pulling Expansion Tank And Remove Vent Hose

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Pull out expansion tank in upward direction.

Installation 

Expansion tank lugs must locate on radiator.

Fill system with recommended coolant, vent system and check for leaks,

refer to 17 00 039 BLEEDING COOLING SYSTEM AND CHECKING FOR WATER LEAKS .

Fig 9: Pulling Out Expansion Tank In Upward Direction

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