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Once the engine cools to normal temperature does it stay there?
If so then I would believe a sticky thermostat.
To be safe I would check for evidence of a cracked/warped head or bad headgasket. (eg. hydrocarbons in the antifreeze)
A bad waterpump will cause the engine to overheat and stay that way. I suppose the pump could be siezing and the timing belt is slipping over the pulley but I don't know of that happening to anyone here before. (that is without a total failure)
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