So recently I started noticing that my Corsair H55 was occasionally making gurgling noises or I guess "water movement noises".  There are no grinding noises indicating a failing pump. The fans are spinning at the proper RPM's and the pump is connected to a working power source. I have been been experiencing issues with hard lock ups (which typically indicate unstable OC's on the processor) so I ended up lowering my 2500K's OC (I actually bumped it up to 4.6 GHz a while back). 

However I was curious one day and watched my processor's temperatures fluctuate quite a bit while the H55 made gurgling noises. The temperature didn't skyrocket by any means, but I was a bit intimidated by the noise. Whats the worst that could happen? ...The H55 spontaneously bursts and liquid splashes all over my components!! But seriously, I decided to leave Open Hardware Monitor running while doing basic activity (programming, web browsing--not even anything cpu intensive) and I noticed this: