I have a problem, I hope it's not what I think it is... I am using plain water in my radiator cause I'm lossing water an don't know where... yesterday I went to put water in it an it had foam at the top of the radiator it looked like hot cococa (like swiss miss) I did put some clog stuff in it a few months or year ago an never cleaned the radiator.. I'm hoping this is causing the problem or maybe even rust cause it is orginal radiator..... an not a blown HG.....