Now, going on the plethora of information you're provided, it could be that
it's low on coolant - could be the thermostat's stuck... the radiator could
be plugged, the water pump impeller could be eroded... could be an air
pocket, or a number of other, more obscure things.
How about a little more information... ie. when does it overheat - what
type of driving. What have you done so far to try and isolate the problem?
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