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Could be a number of reasons. Insufficient engine coolant, old and burned out engine coolant, improper heat exchange from the coolant to the ambient air in the radiator (this could be due to blockage in the radiator, insufficient pressure in the cooling system, bent fins in the radiator, etc.), bad water pump, blockage in the cooling system, improper coolant.... take your pick.

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Q: Why is your 1999 Buick century custom overheating?
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