Question about 1998 Ford Taurus

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Over heating when ideling ,then when you race the motor it goes back to normal..??? is there a senser ?? i allready changed heater core ,thermesta .

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I'd suggest looking at the fan clutch. When you increase the RPM of the engine the fan is spinning faster and pulling more air through the radiator - at idle, it isn't pulling enough air.

Posted on May 26, 2011

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  • jackbeans123 May 26, 2011

    okm ill look at that ,but i think there is a sensor that tells the fan to turn ... right ..???

  • Johnny Tumlinson May 26, 2011

    Yes, the fans in your Taurus are 2 speed fans. They are turned on and off by the PCM through it's monitoring of the engine temperature by the "Engine Coolant Temperature Sensor" and the vehicle speed. Low speed turns on at a engine temperature of 210F99C and turns off at 204F/96C. The fans will turn to high speed when the temperature reaches 225F/120C.

    When you "race" the engine, you are making the water pump circulate coolant throughout the engine faster, therefore cooling it down. It is possible that the ECT is providing faulty information to the PCM and not letting it turn on the fans.

    However, I'm guessing that I was making the improper assumption in my original solution that the ECT had already been ruled out as a possibility since you went to the trouble of replacing the heater core and thermostat...

  • jackbeans123 May 26, 2011

    yea that is what a mechanic told me to replace first ... so he did ......and also the heat and ac doesnt work all the time so thats why iam thinking the sensor ......

  • Johnny Tumlinson May 26, 2011

    I'd say you are dealing with separate issues. Get the overheating issue fixed first - then worry about the HVAC issues.



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