I cannot for the life of me figure out why my pumps are so loud. I have tried 3 different pumps(sorta different), swiftec mcp350, mcp355, ddc 3.25... Still, all of them make the same squishy water sound. Is it because the pump is too close to the radiator? Also, the system is fully bled... I let it run for 2 days straight, and then sat overnight, and ran some more, still makes the same noise.

Here is a video of the sound...

http://www.youtube.com/watch?v=TVMClISPAI0

You can hear it pretty good, the squishy, rattling sound.