water leak

With the motor running take the radiator cap off and see if there's bubbling in the coolant in the radiator. - It's best to fill the radiator to within a inch or two from the top. - If bubbling is occurring, then plan to pull the heads and have a machine shop check the heads for warpage, if warped have them planed, and replace them. - Cometic head gaskets are a good choice. -- Good luck -- Merry Christmas.