Coolant flowing off back of belly plate.

[bcredliner]

If the coolant is streaming out as fast as you pour it you can find the source without removing anything other than the engine cover, the plastic piece across the back of the engine and the plastic splash shield under the engine.

If the leak only shows when the cooling system is pressurized than top off the coolant, let it run until you see coolant leaking, let it cool. With a flashlight for the visible hoses, running your hand along hoses that are behind the engine or tracing leak to highest point on engine I am confident you will confirm the source. Always troubleshoot until the core issue is found. In the end it always saves time and $$$$$.

Here is a link to viewing parts. I pulled up the radiator section. There are other sections that will show other hoses locations. RealOEM.com - Online BMW Parts Catalog