The fan is controlled by a thermal "something" This item senses temprature and turns the fan(s) on and off as need be. IF it is on all of the time, Look for sensors in the water system, on the engine, usually up high... You can disconnect one at a time while shut down, and the fans should stop when you get the correct one. Other designs use a relay, but more failure happens at the thermal transducer...
I had the same problem about a year ago. This turned into a problem of the fan NEVER turning on. My car overheated and my radiator burst on the freeway. Turns out that there is a fan controller mounted behind the radiator that had gone bad. This same part was RECALLED on the 2003 Lancers... seems they still didn't get it right in 2004.
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The fan is controlled by a thermostat sensor or coolant temperature sensor,it si located at the engine water passage,these sensor detect the temperature of the coolant in the engine during operation and shut down or check the fan relay located at the engine compartment
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