Hello. I have a 2006 GTO M6. Let me start from the beginning. I had a coolant leak from the tank on the original radiator, so I replaced it with an orielly radiator. I later plan on getting a nice all aluminum one that will fit with my Vararam CAI. Anyways, I took my car to the drag strip and made a pass, and when I had gotten back and shut it off. I noticed antifreeze on the ground. The car was a little hotter than normal. I waited for it to cool down added water then drove home fine. Today I was driving home from work stopped at Lowes. When I came back out I noticed antifreeze on the ground. I wasn't far from home. So I started it up and began driving home. I noticed the temperature gauge rose above the normal temperature and I pulled over. Right as I was about to shut it off the temperature gradually drop to normal operating temperature. Do you guys know what is causing this?