My 08 Mercury MIlan would do that and had it back to the garage 6 times. They changed thermostat once,no good new antifreeze ,no good. Seems like it only did it when we were on a trip away from home & in hilly sections. Finally they found some sensor that was messing up. . Lucky for me Ford motor Co. took care of the bills because 2 times they had to pay for car rental for 2 weeks each .
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