What can cause my car to overheat?

I have a 2002 mitsubishi lancer n won't start n coolant coming from exhaust pipe

My car is showing overheating at forty one degrees ambient temperature, especially, when I needed to turn on A/C in such hot climate the, car overheat sensor blinks for warning alarm at last heat level. And even on normal 100 km/hr drive speed it gives same status for every 20 km (approximate). I have noticed coolant reversal in the overflow vessel on first diagnose. And then on second diagnose the vessel was empty. What could be the reason please? Can anyone help please?

Thanks

My 2002 mitsubishi lancer overheated and the radiator had to be replaced and we put a new thermostat in. It starts and runs fine sometimes, but sometimes it is very difficult to start and keep running. This has been over a 2 day period. There is no water in the oil. And no oil leaking around the gaskets.

When I tried to start it this a.M. I could hear sounds like water circulating and a light clicking sound which I don't remember hearing before.

Any advise you can give will be appreciated. Thanks, Wanda

The other day I was driving to work when my engine started to get hot. When I came to a stop there was steam coming from under the hood.I made it home and the next day checked it. There was coolant all over the engine compartment and very little in the radiator.I have changed the radiator cap and the thermostat but when I took it out on the highway it still gradually gets up to the red zone and steam comes from under the hood. Does this mean that there is a blockage in the radiator or that the water pump is not circulating properly?

Your question: "Had accident few weeks ago hit a toe ball an it pushed in my radiator since then iv driven it everywhere last week one day car kept over heating for first time since accident an then it was on high temp an then cut out now it's radiator been checked flushe."