Okay, my Bentley manual, this discussion forum, and every other resource I can find agrees on the correct procedure for bleeding my 1990 535's cooling system. So far, so good.

I do as instructed, and get to the part where the engine is running at normal operating temp and it's time to open the bleed screw again.

I do, and coolant comes seeping out, rolls right down the cam cover, into the fan, and all over me and the engine bay.

What's the trick to this? Is parking uphill a must?