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Actually a "freeze" plug hole is actually a hole that was made to hold the sand mold. Coolant passages are intirquet and they left a hole so they can get all the sand out of the passages after making the mold. The hole is reminents of that process.
People call them freeze plugs for the very same reason economic described. People running too much water in colder climates and it was the weakest link. It happened by chance. A casting hole that serves another purpose.
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