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Bob's theory was what I'm thinking. If the ice had no where to expand (no air trapped in the radiators, some old places have that) they as the temps drop, the ice forms, but the water had no where to go, so it forces the ice out the top.
So its all water system? No antifreeze? Antifreeze could have prevent the catastrophic failure. Would have made it a slush, but not frozen.
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