17 00 039 Venting cooling system and checking for leaks (M54)

WARNING: This page is about a different car, the 2005 BMW 530i, 2005 BMW 525i, 2004 BMW 530i, and 2004 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

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

No vent screws on radiator or on thermostat housing.

Cooling system is vented while it is filled and during subsequent idle operation.

NOTE:

Before filling, turn on ignition. Set blower to low level. Seat heating controller to maximum temperature. This ensures that the heater valves are fully opened and the auxiliary water pump starts up.

IMPORTANT: The auxiliary water pump must deliver coolant in order to ensure fully venting!

Installation:

Use only recommended coolant.

Check cooling system for leaks.

Perform filling operation slowly.

Pour coolant into coolant expansion tank up to MAX mark.

Start engine and run at idle speed for approx. one minute (cap open). Then adjust coolant level to MAX.

Fig 1: Adjusting Coolant Level To MAX

Courtesy of BMW OF NORTH AMERICA, INC.

Close cap and run engine up to operating temperature until main thermostat opens. Check cooling circuit and drain plug for leaks.

IMPORTANT: The engine must be cooled down before the coolant level is checked. Coolant temperature must not exceed 30°C. If ambient temperature is above 30°C, allow engine to cool down to ambient temperature at least.

Check coolant level and adjust to MAX.

NOTE: Do not fill coolant expansion tank over MAX level as overfilling will cause the coolant to overflow.