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If steam is coming from the radiator, it could be cracked. Are you losing coolant?
If the steam is coming from under the cap, it could be as simple as the cap needing to be replaced. If steam is coming from under the cap AND coolant is boiling out of the overflow, your thermostat is probably not opening... which would explain why only half (assuming the top half) of the radiator gets hot and you're not seeing any movement of fluid. In order for the water pump to move the coolant enough for you to see it happening, the thermostat needs to be open.
1. Try going to Vatozone and getting a new radiator cap. If it still overheats...
2. Try running it without a thermostat JUST LONG ENOUGH to see if an onobstructed system cures the overheating. If it works fine, you need a new thermo- which IMHO you should have replaced since you already had everything apart. DO NOT run it without a thermostat any longer than needed for troubleshooting! It's there to keep the system at the proper operating temperature... not to keep it 'cool' if you know what I mean.
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