Thanks Dimevivo... Having made the mistake of replacing my thermostat and NOT the water pump on my my e60 (N52), i could seriously kick myself since the water pump is about to go.
I will say, the t-stat job simply sucked. It took me hours to figure out the best angles to reach the hose clamps. Once i sorted that out, it was easy.... but i needed tiny munchkin hands to get into the small spaces.
So, soon I will be replacing the water pump. There are a few great OEM discounters from which I will buy the part. I like these guys:
Perhaps I will do a DIY for this one since I didnt last time. And NOT do it in the dead of winter on a cold garage floor.