Venting cooling system

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

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

Ensure that both cooling circuits are filled before starting the automatic bleeding procedure. The bleeding procedure is automatically started simultaneously for both cooling circuits. If the bleeding processes is started while one of the cooling circuit is empty, there is a risk of damage to the coolant pump from running it dry.

Switch on the low-beam headlights to perform the bleeding procedure. If the low-beam headlights are not switched on, the ignition (Terminal 15) will switch off automatically after a certain period of time and interrupt the bleeding procedure.

Top coolant up to the upper edge of the expansion tank. Coolant level may not drop further! No drop in coolant for approx. 1 minute.
Connect battery charger.
Switch the ignition on.
Set heating to maximum temperature. Press Automatic button. Then set the blower to the lowest speed.
FES (driving experience switch) must not be in ECO PRO!
Press accelerator pedal for 15 seconds to floor. Engine must not be started.
The venting procedure is started when the accelerator pedal is pressed and takes approx. 12 minutes.
Refill expansion tank up to top edge immediately after drawing off until empty.
Adjust expansion tank to maximum level at end of bleeding procedure.
Check cooling system for leaks.
Close expansion tank.
If the venting procedure has to be carried out again, allow DME to drop completely (ignition key removed for approx. 3 minutes), then repeat from Point 5.