Draining Coolant:

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

Open cap (1) on coolant expansion tank.

Fig 1: Opening Coolant Expansion Tank

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Remove front splash guard.

Drain, catch and dispose of coolant from radiator.

Fig 2: Removing Coolant From Radiator

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Remove reinforcement plate.

Open drain plug (1) on engine block.

Fig 3: Opening Drain Plug On Engine Block

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Drain, catch and dispose off coolant.

Installation:

Replace sealing ring.

Tightening torque, refer to 11 11 5AZ in COOLING SYSTEM - TIGHTENING TORQUES .