Question about 1993 Subaru Legacy

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Temperature fluctuation As soon as the ignition is switched on, the cooling fans come on, whether the operating temperature is reached or not. Also the temperature comes up to normal, under normal driving conditions, but as soon as you coast downhill the temp. guage drops to way below normal, indicating the cooling water cools down.

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The water temp sensor is a switch that closes the circuit when the temp reaches a certain level and that switch sends power to the fans. Either your water temp sensor is faulty (always on) or the wiring from the sensor is shorted out. 
The easiest fix would be to replace the temp sensor. They are cheap, and replacing it will likely fix the problem. Your local parts store can get you one and show you where it is located on your car. 
If it doesn't fix your issue, at least you'll have eliminated that from the problem and can search for the short in the wiring. 
If you know basic electrics a simple auto circuit tester (cheap at any auto parts store) or multimeter will help you trace the short. If you're competent with electronics, you can always wire the sensor to the fan independently of the car's wiring harness to workaround the short. Be sure though that you have a workshop manual with a wiring diagram and that you make the correct connections to the switch, fan and the car's 12V power.
I'll bet that replacing the sensor will take care of it though.
Hope this helps.

Posted on Dec 27, 2008

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-----------------------------------------------------------------
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DESCRIPTION AND OPERATION Cooling Fan, Electric sty~us~en~file=ani_caut.gif~gen~ref.gif WARNING: WHEN WORKING IN THE ENGINE COMPARTMENT, STAY CLEAR OF THE FAN BLADE. BECAUSE IT IS ELECTRIC AND TEMPERATURE SENSITIVE, IT CAN START AT ANY TIME IF THE IGNITION IS ON.
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