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I've seen 2 set screws in the same hole. Not sure what it was on, but you might take a second look at that.
It's most likely your heater hoses leaking at the heater core nipples or the heater core leaking.
If you want to drive it, disconnect the heater...
I have that information, Ill get it for you tonight when I get home, if someone else hasn't chimed in by then.