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Freeze plugs (also called "blind" or "expansion core" plugs) are
small steel plugs used to seal the holes in the engine block and head
made in casting. They expand and flatten as they are driven into
place, and make a tight seal. These are designed to hold the pressure
of the cooling system, but to pop out if the coolant in the block
ever freezes.
If you have a leak in your cooling system, freeze plugs are one of
the areas to have checked.
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