I am trouble shooting my overheating problem. My car used to sit around 1/8 to 1/4th and now it is almost always at 1/2 to 3/4 the temp guage. The add coolant buzzer also comes on frequently and It is always low. Does the coolant usually get pushed out the filler cap at idle unless it is reved? do those bubbles indicate a blown coolant seal or just air in the system?
