I'm trying to help my son who bought an '01 Cobra a couple of months ago. It ran fine the first month, but then about a month ago started running hot. It goes well over 210, and he shuts it off to let it cool. It takes it a few (about 20) minutes in idle to reach the hot temps, but just keeps climbing. No mods were performed since he bought it. Runs hot at idle, or in traffic (highway and city). The fan runs. When it gets really hot, the coolant is running out of the cap on the plastic tank (forget the term) on the top corner of the radiator. We've replace the thermostat, after checking it opens in boiling water, and I'm pretty sure it is the right direction. We have the spring pointing up towards the top of the engine. Have "burped" it several times using the bleeder bolt. And burped it with the heater turned on. He is using the 50-50 blend of anti-freeze. When looking through the hole where the bleeder bolt is, you can see coolant flowing. No coolant in the oil, and I don't believe there is any coolant leaking into the exhaust - no sweet smell. He's very frustrated, and I'm pretty much out of ideas. Only ideas I can come up with are bad heads/gaskets, or a clogged radiator. The car doesn't have high miles on it, only about 60K. One thing I did notice is that the o-ring gasket on the bleeder bolt deteriorated and fell apart in pieces on the ground. But, he tightens it up pretty snug using a socket when he is finished burping it. And the belt orientation isn't the same as on the diagram in the service manual (forget the name, it isn't a Ford book). Any suggestions? He's about to the point of getting rid of it and letting it be someone else's problem! Thanks!