post #21 of 21
For the first week my pump was silent. Then it just started rattling. The replacement pump I got made noise too. Damn rattling sound. So I tried antifreeze I'm guessing since its thicker than water its pretty much muffling the noise.

I've tried water with the res out of my case with a tube from outlet to inlet sitting on a foam pad and they both rattle. Fill em with antifreeze and they're quiet.