17 13 020 Removing and installing/replacing expansion tank for charge air cooler (N63 B40/B44 O 1)

IMPORTANT: Risk of scalding!
Only perform this repair work after engine has cooled down.

Necessary preliminary tasks:

Release the coolant hoses and wiring (1) from the expansion tank and set aside.

Fig 1: Identifying Coolant Hoses And Wiring

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Release screws (3).

Tightening torque 17 10 7AZ .

Pinch off coolant hoses on the expansion tank with PINCH-OFF TOOLS (to prevent coolant from escaping).

Release coolant hoses (1) and (2) from expansion tank and detach.

Catch and dispose of escaping coolant.

Remove expansion tank.

Fig 2: Identifying Coolant Hoses And Screws

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Assemble engine.

Fill and bleed COOLING SYSTEM for charge air cooler.

Check cooling system for charge air cooler for leaks.