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2002 nissan altima when the car is doing 50 mph or more it over heats lower speeds it does just fine

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Check to see that your not low on coolant after the vehicle cools down would be the 1st step. If thats okay then you need to have the water pump flow tested and make sure the thermostat is working properly. Either way I would consider a cooling system service given the age of the vehicle especially if you have not had it done in the last 2 years. Hope this helps.

Posted on Sep 30, 2010

  • cparris6 Sep 30, 2010

    I HAVE INSTALLED NEW THEROMOSTATS FLUSHED RADITOR STILL OVERHEATS

  • mikehead Oct 05, 2010

    Did you have the water pump flow tested, your not moving enough coolant at higher speeds which usually indicates a restriction somewhere (radiator, heater core, etc) or a water pump that is going bad. Could also be a faulty ECT sensor.

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