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Not a seal; there are likely none, unless it's got welded on tanks on the ends of the core. The heater core is just another radiator, but smaller and inside your dash. The material used to make these must be crap, as it appears something is eating away the water passage from the inside causing them to fail. Until we get some pictures of failed cores we may never know if there's any pattern to the failures of if they are all random breaks.
John B.
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