Last weekend I got the 05' out and there was a big puddle of coolant under it after storing all winter. I filled the reservoir and after it warmed up it stopped leaking. but when I took it out to drive it after a few minutes the temperature gauge kept rising and wouldn't stop. I pulled it over and loosened the over flow cap,heard a hissing sound ,the fuild almost filled the reservoir ,tightened the cap restarted it and it ran fine with the temp staying at 220. now today I took it out and the same thing happened started to overheat,opened the cap ,restarted and was fine around 220. I haven't had any leaks since it warmed up the first day. any suggestions?