I've noticed that the cooler has a fill port with a warning label on it. I've had this cooler for several years now. I've owned it when it first came out and it's not working effectively any more. My fx 8350 stock idles around 38-40, maxes around 60c with Prime. The pump and everything seems to be running just fine from what I can tell. It's either bad thermal paste or the water needs to be topped off I'm guessing.
Does anyone know if it's safe to refill through this port? Or will it leak? I personally don't see the point of installing a feature like this if it cannot safely be used. The voiding warranty part I understand. (Some people probably don't know how to turn a screw).
On a side note a small 4.4 overclock with no volt increase takes the socket close to 70c.
As for closed loop yes... I thought you were going to drain it by opening even though you souldn't? If you are going to drain a closed loop system then it is no longer a closed loop any more it becomes a custom loop.