The engine in your Ford Explorer has freeze plugs, also called expansion plugs, mounted in the sides of the block. Freeze plugs are supposed to protect the engine block if the water in the engine freezes -- the expanded water is supposed to push out the freeze plug, although that doesn't always happen. Freeze plugs are made of thin steel compared to the engine block, and even with an anti-freeze mixture the plugs can rust out and require replacement.
Read more: How to Replace a Freeze Plug on a 1992 Ford Explorer ' eHow.com http://www.ehow.com/how_7670495_replace-plug-1992-ford-explorer.html#ixzz2IBxfNrjb
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