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Generally, it is the water pump. Very few (like zero) reports of a leaking timing chain cover.
Just saying.
Well, now you have one. The mechanic who's replacing my water pump called me this morning to let me know that the timing chain cover is also leaking. I stopped by and took a look since it's only two blocks from my house, and sure enough, it's a leaky timing chain cover.
First time I really recall hearing of it, though....