I'm just guessing here as we don't have many in Australia.
Sounds like your waterpump might have packed it in, also check your thermo fan is running normaly at both high and low speeds.
Easy way to check is start the car and let the engine run untill the low speed setting kicks in, then turn on the A/C, which will start the high speed setting.
If either fan setting fails that will probably be why. Once you have done the fan test, let it get good and hot, then stop the car over a dry piece of concrete, then check for any water leaks.
Failing that, replace the water pump and see how you go.
Just like a Tsunami.