i haven't dealt with refrigeration in computers and stuff really, but i've been around r12/r134 setups in cars.
i don't know the actual pressures run, but in the high side i don't think a water block (especially with a poly top) would be able to hold just from the pressure.
i don't know about the low side, but i still wouldn't risk it. that stuff usually comes out pretty briskly with a leak, and a/c hoses and fittings are generally built for pretty high pressures.
probably want to get a pro's opinion, but that's just from my little experience from auto ac setups.
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:shrug:
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