I Overfilled My Coolant
I Overfilled My Coolant . If there isn't an overflow tank, you have what is called a degas bottle in a sealed system that should only be filled to the max line to allow for coolant expansion and air removal. 27.0k members in the askmechanics community. HELP. Possible Radiator leak or overfill MyG37 from www.myg37.com 5) low level of coolant. When adding coolant to maintain correct level, do so at coolant reserve/overflow tank. When the engine cools down again the coolant is pulled back into the system.