If's it's not leaking water. then your thermostat may be stuck in the closed position and will need replacing. if thermostat is easy to remove you can try removing it and see if it still over heats. also check the water pump, there is a small hole in the housing and if it's leaking water out of the hole then the water pump is bad.
Could be a blocked radiator, a stuck thermostat, a water pump failure, a drive belt off or blocked pipework. Firstly check the security and condition of the drive belts. Then turn a hose on the radiator fins / mesh part and make sure water passes through it well. Then remove the top and bottom radiator hoses. When the water has all drained out, put a hose in the top and turn it on. If water flows freely through the radiator, that's not your problem. Turn your hose on the top hose into the engine. Again you are looking at how freely the water flow's through the engine. If a lot of water comes back at you out of the top hose, especially if it is under pressure, it is almost certainly a jammed thermostat. They are usually quite cheap, so keep your fingers crossed for that. Next, remove the drive belt from the water pump (normally quite low on the engine, and usually next pulley by crankshaft pulley.) turn the pulley by hand. There should be a little resistance, but not much. If the pulley spins freely, or is notchy, or is jammed, then the water pump has failed. Not quite so cheap, but still not a fortune in most instances. Good luck.
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