Pure antifreeze is no good. There has to be water in the mix. I use to mix coolant for a refrigerated glycol cooling system. Not only does the mixture affect the freeze point, the heat transfer properties change based on the water/glycol ratio. Since ethylene glycol is viscose and like syrup, the water also changes its flow, surface tension and heat transfer properties.
I found my radiator cap was frozen when I first got my car. I had to press it down on my work desk to get the spring to collapse. I know do it every week. This frozen spring could be the reason for some exploding radiators.
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