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The Mercury Villager and Nissan Quest are basically the same vehicle. The radiator is cooled by an electric fan and thermostat. If either of these are malfuntioning, that could be the cause. Otherwise, all of the normal things such as low coolant, bad water pump, clogged radiator, bad radiator hoses, bad thermostat,and incorrect timing could all cause the engine to overheat.

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17y ago

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