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Depending on additive, coolant can get above 220 unpressurized, perhaps 240/ 265 with a 50/50 glycol mix according to the container of synthetic glycol I have. The 212 would only be an issue above a couple thousand ft above sea level. Beer boils at my house right around 203.4 degrees even with malt sugar levels being really high. Wasn't important enough to measure the boiling point of tap water because pretty much anything beer harmful is dead above 160.
Having said that, the heat transfer with glycol is lower. Afaik, the only advantage to pressure is heat transfer improves allowing a smaller radiator
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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