Being a novice at best, I don't quite understand what you are recommending. I thought you stated that if you would have replaced the head gasket, you could have avoided the head cracking in so many places. How can replacing a head gasket prevent this and if you already have a system that stays pressurized overnight, and that's an indication of a cracked head , isn't it too late anyway at that point? Please explain., also, my diesel remains pressurized overnight for some reason as well. I mean, when I take the rad cap off the overflow tank, it lets out a belch of pressurized air too. Does this mean I have a cracked head even if I have no signs of other problems? I know the radiator was replaced before I bought it.