I have searched everywhere with no luck. Whats happening is that coolant is wanting to come out from around the cap, not a lot just a little after you beat on it. Well the other day I topped it off when the car was cold drove it started smelling antifreeze so I look and it have overflowed car the cars temp was never over half way on the gauge. I'm stumped I have let it run with the cap off and it still does it. It had never done this till I flushed the system. Any suggestions?