17 00 010 Checking For Coolant Leaks Between Cooling System And Combustion Chamber: M43
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Do not check for leaks while engine is running. Engine will overheat!