I have my watercooled system now up-and-running for a couple of months, but what puzzles me is that the water level in the reservoir continuously seems to drop a little over time. I do not detect any leakage whatsoever on any of the components, nor do I see any residual UV traces of spilled water anywhere. I don't think it is due to evaporation as the system is completely closed (the AC reservoir has a screwed-on lid).
After several months I would expect that all the air bubbles from the radiator, CPU-block, GPU-block, tubing and pump are gone, but yet I need to re-fill a couple of cc every week or so. Is this normal ?