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could be simple as explained above but it could also be an indication of a failed head gasket, cracked cylinder head or failed heat exchanger. In my experience, the failed heat exchanger is less common than a cracked cylinder head or failed head gasket. Unfortunately, the cars don't like being overheated.
I would try and run the car as long as possible before purchasing and see if it starts to overheat. This would be an indication of a larger problem. You may also see some white smoke burning off from the exhaust. If it overheats or you see oil in the coolant tank, probably best to walk away or budget for a costly engine repair.
Unfortunately, some sellers can flush oil and coolant and sell the car with no immediately apparent issues.
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