While letting the car warm up to test out new radiator, I noticed a click just about on per second. From under the car, I could see a water hose flexing in synch with the clicking. My car (2010 e88) has about 102K miles. There is a bunch of silicone gooped up around the mounting screws of the water pump (Is this a known leaking point?), so I figured that the water pump might have been replaced before i got the car at 70K miles.

Is this clicking a sign of a bad water pump, or is this normal?