Overheating Issues!

If the timing is advanced to much wont that make it overheat too? Or is it only when retarded to much?
i've got a buddy who swears that messing with the timing will help. he did it in his car when he was haveing the same sorta issues, and it fixed the problem.

Go to the auto parts store and get a bottle of radiator flush. It will have directions on the bottle.
i will do that tomorrow! also going to throw in some water wetter super coolant..cant hurt the engine any.