Draining coolant

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Open sealing cap (1) on coolant expansion tank (2).

Installation note:

Close sealing cap (1) until the arrow marks line up.

Fig 1: Closing Sealing Cap Until Arrow Marks Line Up

Courtesy of BMW OF NORTH AMERICA, INC.

Open coolant drain plug (1).

Drain, catch and dispose of coolant.

Installation note:

Replace sealing ring.
Tightening torque 17 11 2AZ .

Fig 2: Identifying Coolant Drain Plug
Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten and detach coolant hose (1) from thermostat housing.

Drain, catch and dispose of coolant.

Fig 3: Identifying Coolant Hose

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Adding coolant:
Use only recommended coolant.
Observe mixture ratio. See COOLING SYSTEM - OPERATING FLUIDS .
Observe capacities. See COOLING SYSTEM - TECHNICAL DATA (N54) .
Observe bleeding instructions without fail.
FILL AND BLEED COOLING SYSTEM .
Visual inspection of cooling system for tightness.