the weep hols is down low on the front of the engine, if it is open, then any coolant that leaks past the first seal will go out the weep hole and alert you that it is leaking before it gets past the second seal, some times the weep hole will get clogged adn you won't know you have a problem till you notice you have water(coolant) in your oil. Its not that big of a problem to fix if it is bad( its not that easy either).
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