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momokins
momokins asked in Cars & TransportationCar MakesMercury · 10 years ago

99 mercury sable overheats on the highway only?

I changed the water pump & thermostat and flushed the coolant. The vehicle sits and doesn't overheats. There is no white smoke coming out of exhaust. It only overheats on the highway. Any suggestions???? Thanks in advanced.

2 Answers

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  • 144289
    Lv 7
    10 years ago
    Favorite Answer

    overheating at highway speeds =

    water pump

    thermostat

    blocked radiator

    keep in mind if the coolant was rusty, the radiator maybe blocked, usually this car, water pump impellers wear out

  • ClassicMustang
    Lv 7
    10 years ago

    Try a new bottom hose..

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