I think he is saying he wants to use r12 (or a refrigerant) INSTEAD of water, through the water block, as a replacement for water. I do not think this is viable, nor will the refrigerant have the heat absorbing capabilities to perform as a replacement for water in a normal water block system, nor will the water pump be able to pump the r12 or whatever refrigerant you use. Probably have all sorts of hose issues and leakage, etc.
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