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sounds to me like the thermostat has gone

... or possibly water pump failure (eg at 100K miles) or an oil problem.

First check the coolant level. If it's at the proper level it is probably the thermostat It could be the thermostat, water pump, or even the radiator fan switch. If it only overheats when the car is driven at low speeds or in heavy traffic it might be the fan switch. If it overheats even when moving at a constant high rate of speed (over 45mph or so) then it is probably the water pump or thermostat.

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2011-09-13 22:57:02
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Q: What could cause a 1988 16v VW Golf GTI to overheat?
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