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To be honest it sound like vapor lock due to air in the system. However, I say try the no T-Stat approach first and bleed again. This will tell you If it is locking up due to air in the system. If it cools and doesn't heat up you know you were locking up the T-Stat with air (provided it works properly). If it still overheats there is something wrong internally, eg. water pump, block/head. Also is it burning coolant out the exhaust, thats a sign of a head gasket issue? Does the temp react to different throttle positions/rpms, that could be a sign of pump issues? The fact that it is not circulating coolant leads me to believe it is something with the T-Stat or air in the system. If it builds pressure in to the radiator, the pump is pumping and the cap is more than likely working ok so that only leaves the T-Stat, radiator and block to be a problem. A sign of air in the system is cold air out of the heater system when the temps are normal/high. To test that the radiator didn't break or get restricted disconnect the upper and lower hoses from the engine and blow water through it with a hose, if you find restriction you'll know. (Becareful with pure water through the system for any length of time because pure water can rust a system if left in there long enough.)
Check some of these things and report if you haven't found the problem yet.
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