The fan staying on after shut down is likely a faulty thermal A or B switch.

As for the overheating, it is possible that during traffic, the engine fan became inoperable. With the AC on, the compressor fan should run continuously. The engine fan should circulate on and off via signals from the thermal switch that detect engine temperature.

-possible switch failure
- or the fan itself has bit the dust.

Radiator could be leaking, the OEM plastic radiators usually develop cracks along the upper tank causing a slow leak. Being that the car is a 96, if the radiator is original... I'd check it first.

If your coolant level is fine, then I would suspect either the water pump or thermostat (I'd check the thermostat first)

Check for leaks in the hoses, or a busted hose.