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It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.

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Q: Why does Overflow Reservoir on 1999 Ford Taurus keep overflowing gauge doesn't read hot changed the hoses flushed Radiator replaced Thermostat and reservoir?
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