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Compatible with what?
Yes.
On the bottom of the radiator left side.
Yes they are the same
It should be, yes.
NO. They are not even close. Will not interchange.
Yes it is in the radiator.
Any 1983 - 1993 S10, and 1983 - 1994 Blazer, Jimmy, or Bravada.
Bottom of radiator, or possible on the lower hose connection.
It is located just below the lower radiator hose.
It is that drain plug looking thing at the bottom left of the radiator.
There isn't one.