I don't know if my cap is bad, but I would like to purchase an OEM one to see if it fixes my problems. It can either be two things, as everything else has been replaced on my car. It is either the cap or the lower radiator hose causing my overheating problems. I did notice that there is no pressure being released when I undo the cap after running the car. So, I'll start here. Please e-mail me or call me with a price.