17 00 039 Venting cooling system and checking for water leaks (N63)

WARNING: Danger of scalding!
Open sealing cap only after engine has cooled down.

IMPORTANT: You must protect the alternator against contamination before carrying out any work on the coolant circuit.
Cover alternator with suitable materials.
Failure to comply with this procedure may result in an alternator malfunction.

IMPORTANT: Electric coolant pump!
FOLLOW INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

IMPORTANT: Lifetime coolant filling:
Never reuse used coolant!
When replacing and removing components which rely on the corrosion protection effect of the coolant, it is essential to change the coolant. The cooling system must therefore be drained and refilled.
In the case of other removal work involving the draining of partial quantities of coolant, replace these quantities which have been drained with new coolant.

Only when refilling!

Use only recommended coolant. See RADIATOR -- OPERATING FLUIDS .

Observe mixture ratio. See RADIATOR -- OPERATING FLUIDS .

Observe filling capacities.

Perform filling operation slowly.

Adjust coolant level to max.

Fig 1: Identifying Coolant Level Mark

Courtesy of BMW OF NORTH AMERICA, INC.

Close coolant expansion tank.

Installation:

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

Fig 2: Identifying Sealing Cap And Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The following venting procedure is necessary when a part is replaced in the cooling system or when the cooling system is refilled.

Adding coolant:

Fill expansion tank slowly with recommended coolant up to lower edge until fill level stops dropping. See RADIATOR -- OPERATING FLUIDS .

Observe mixture ratio. See RADIATOR -- OPERATING FLUIDS .

Fig 3: Identifying Coolant Level Mark

Courtesy of BMW OF NORTH AMERICA, INC.

Venting cooling system:

NOTE: Do not leave the coolant expansion tank cap open during the venting procedure.

Open vent plugs on coolant feed lines to turbocharger.
Add coolant up to top edge of expansion tank. Coolant level must not drop further! No drop in coolant for approx. 1 minute. Close vent plugs on turbocharger when coolant emerges.
Set heater to maximum temperature. Press Automatic button. Then turn blower down to lowest stage for a minimum period of 5 minutes.
After switching off heater pump, add further coolant up to top edge of expansion tank.
Check cooling system for leaks.
Close expansion tank.
Start engine. Allow engine to idle for approx. 1 minute. During this period, press accelerator pedal 3 times (each time lasting 5 secs.) to approx. 3000 rpm.
Warm up engine and activate map thermostat via BMW diagnosis system.
When engine has cooled down, check coolant level and adjust to max.

Close coolant expansion tank.

Installation:

Close cap (1) on expansion tank (2) until arrow markings are flush.

Fig 4: Identifying Sealing Cap And Coolant Expansion Tank

Courtesy of BMW OF NORTH AMERICA, INC.