my civic runs good untill it gets warm then the coolant runs back to overflow tank. it has no water in the oil,and it does not run hot untill low on coolant. i have put a new radiator cap on and a new thermastat. i ran a diagnostic on it and it said codes p301 & p1399. can u please help me?and i have also put a new radiator on this car.
Feb 22, 2010 at 2:01 PM