With the overheat/temperature light coming on and the purging of antifreeze leads me to believe you have a leaking head gasket. When everything is cooled completely remove the radiator cap and start the engine, if tiny bubbles are coming to the surface of the antifreeze, that confirms that the head gasket is leaking hot gases into the cooling system.
If it's overflowing.... I doubt it was just sitting for two hours. Overflowing is because of overheating or a blockage, which only affect the car when it's running. It is not overflowing, but simply leaking, then you have a leak. Pressure test the system, replace what's leaking, and, depending on the coolant condition, top up or flush it.
I suspect this vehicle has been overheated, because you asked about the lights for engine/coolant temperature, and because you said "overflowing". If this is the case, do the same thing as if it were a leak, but have a technician check the cylinder head for fractures and warping as well.
Next time pay attention to the temperature gauge and don't wait for the "idiot light" to come on on the dash. A slightly high gauge is a problem, but an engine/coolant temperature light is usually an expensive problem.
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