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I'm thinking you probably have an air bubble in the radiator or somewhere that's blocking the flow of water.

The O-ring is what makes the seal between the pump and the heads. If it's leaking, then something's not right with the o-rings. Mine has the gaps, but has never leaked.

I have had one or both pumps fail on my G5 Quad, and I'd like to replace them with a modern LCS solution. How are you powering and controlling the Syscooling SC-P60A pumps? I was originally planning on splicing the pumps into the original wiring harness, but am not sure if they are pin-...

I read the OP about shaking the LCS with warm water and vinegar in it, but it seemed easier and probably more thorough to just run the whole system with this mixture. Also, I have no desire to remove the CPU, reapply thermal paste, etc. and do all that again. Last night for experimental...

This is a repost from the "G5 Quad w/rebuilt LCS will not overheating thread", but I am posting it here so my notes are easily available for anyone attempting the New Blood Mod. I purchased a G5 Quad from the local classifieds. I was actually looking for an air-cooled dual G5, after reading all...

I've been playing with my Quad for a couple of months now. The main thing about the quad is don't get frustrated. If it doesn't work, just put it away and try again later. Mine has the dual pump LCS and I performed the "New Blood Mod" as described in an earler post. Unlike the single-pump LCS...

I'm doing the same rebuild, but have had much better luck. After the New Blood mod, I'm getting CPU A in the mid 40s, and CPU B in the mid 60s at idle. Not ideal. But it's a useable system and I'm not getting thermal shutdowns. I still cannot successfully complete thermal calibration. Like your...