does it blow white smoke at all? can you smell antifreeze out the pipes? engines produce water because of the chemical reactions going on. check your plugs, if any or clean, mark them down as which cylinders they go to then run a comp test, if those are lower with all the others higher readings, those cylinders probably have a leak in the gasket but not enough to cause an overheat, but still needs fixed before it does overheat. it's usally in between 2 cyl's, right next to eachother.