Question about 1999 Ford Taurus

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Here's a wierd cooling fan issue

I have replaced the Coolant Temperature Sensor (temperature switch) in my 1999 Ford Taurus. Today I was having a problem with the cooling fans not coming on, even after replacing the sensor. While the engine was running, I disconnected the wiring harness from the sensor. Checked the terminals with a volt meter, and the fans kicked on automaticly. One would think that it was simply because the cirucut was completed from the leads of the multimeter. Now here's the kicker. I plugged it back in, and the fans turned back off. Powered down the engine, and the coolant overflowed from the expansion tank. Went back out to the car to retest, and just disconnected the harness. Within a few seconds of disconnecting the harness, the fans kicked on at high speed. Nothing was touching the terminals of wiring harness. I plug it back into the sensor, and the fans switch off. Disconnect the harness again, and within just a few seconds, the fans kick back on at high speed. No power is being applied to the harness (nothing is plugged into it). How's this for a wierd car issue?

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  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    ECU? Engine Control Unit? Is this the PCM (Powertrain Control Module) i.e. computer.

  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    Yes, we checked the relay already as well. I think Imaginex probably has the right idea, but in the mean time as long as the engine isn't overheating, is it okay to take short distances?

  • Joseph Weisenberger
    Joseph Weisenberger Jun 21, 2009

    Thermostat tested as being okay.

  • Donnie Matney
    Donnie Matney May 11, 2010

    have you checked the relay?

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  • Master
  • 439 Answers

Thats not too weird as the car would kick on the fans at full speed when it detects a problem with the sensor. Your ECU is not reading the sensor properly and needs to be checked by Ford. I hope this helps you.

Posted on Jun 21, 2009

  • Matthew Boulden Jun 21, 2009

    Yes the computer. I would not drive it too far, you may also replace the thermostat and see if this helps. But I am sticking with the ECU not reading the temp. correctly.

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I have a leaking coolant at the back of the engine....any help or suggestion to solve it?

Posted on Aug 03, 2011

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