I am flushing my coolant system and yesterday I removed all the old coolant, removed the thermostat and refilled with distilled water to flush before putting in the thermocure. Until then everything was fine, I started the jeep with the radiator cover removed and the water could be seen moving well but after a while it began to form a foam in the mouth of the radiator as if it were champagne. What can be caused this? I haven't seen any bubbling in my coolant, could it be the head gasket?
