Question about 1994 Mercury Tracer

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My 94 Tracer temperature gauge reads between 3/4 and 7/8 in the normal range before the radiator fan turns on. I have already replaced the fan temperature switch and the relay. Could my temperature sending unit for the gauge be bad and causing a false high reading?

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  • lesterlaf Aug 02, 2009

    When I check it what should I expect the dash temperature gauge to read with a 180 deg. reading at the radiator?

    Thanks so much for your help.

  • Anonymous Mar 14, 2014

    radiator fan only works when I turn my a/c or defrost on. I replaced the relay and that did not help. is it poss that the engine heat sensor is bad. the temp gauge doesnot register hot



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Yes, it is possible the temp. sender is faulty, but I would do a cross check of the actual coolant temperature vs gauge reading using a cooking thermometer in the top of the radiator.
Take care not to get scalded - check it at about 180 to 200 deg.

Posted on Aug 02, 2009

  • John Bloomfield Aug 02, 2009

    If you allow the vehicle to stand for 5 minutes or so after switching off the motor, the temperature at the radiator and engine block should be near enough to the same.

    Under dynamic running conditions, the temp measured at the radiator may be somewhat cooler to the running temperature of the the motor, as the thermostat will try to ensure that the motor runs at the temperature that it dictates.


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That will work but keep in mind there will be about a 20 deg differance from radiator and engine block, it is normal for the temp to rise pior to fan coming on. I would also change the thermostat if it as not been done.

Posted on Aug 02, 2009


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