If they did, mechanics would be out of work. There is one relatively new product that sounds promising, but if the engine has been overheated a head might be warped. They should also be checked for cracks. You might also have the cooling system tested for combustion gases. If they are present, cylinder pressure is pushing gases into the coolant. That will drive any sealing chemicals away from the source of the leak.
Tuesday, April 12th, 2011 AT 1:15 AM