Q: Car Overheating New Water Pump & Thermostat. Only Overheats On Highway .

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My 07 Expidition Over Heats On The Highway in town its fine on the highway within minutes it jumps all the way to the H . I just replaced the water pump & thermostat & it still overheats.What Could be the problem ?

My car has 145478 miles.
My car has an automatic transmission.

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