Are you by any chance using a Danner MagDrive pump? I had the same experience with a Danner Mag 7: it leaked air no matter how much goop I applied, and consequently it ran hot and loud. I thought, "oh well, not that big a deal." Uh, WRONG!! Eventually the leak got worse, not only allowing air in, but allowing coolant to escape. *All* the coolant. Fortunately my mobo temperature shutdown routine worked and my system survived (the pump and reservoir were outside the case).
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