CORKY

All I can tell you is that it works. I made sure air could get into my fuel tank over a year ago and have had no overheating problems since. I have done hot weather, fast runs with a half-full tank and then slowed right down, even come to a complete stop in traffic - engine still running. Not the slightest sign of overheating. I'm pretty certain this is the answer despite the comments above. Try it, as long as you don't have plans to roll your car, what have you got to lose?