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The fans are controlled by the ECU, the thermostat and the communication between the two. Most likely scenario is a faulty temp sensor - a switch, that tells the ECU how hot the coolant is - and such a faulty switch will prevent the fans from working correctly. If you turn the A/C on, or switch to defrost, at least one of them should be running all the time. Alos, very important, make sure your coolant level is correct. These sensors only measure temp in liquids, if there is not enough coolant to get a correct flow through the system, the fans will not work properly either.
Hope that helps! Btw: I had the same problem in my 99 Impreza Brighton, turned out to be a faulty temp sensor.
Hello, your coolant temp sensor is mounted on the cylinder head coolant crossover pipe. If your standing at the front of your car with the hood open, if your looking at the engine the sensor is to the left of the throttle body under the intake manifold. I think it takes the open end of a 19mm wrench to unscrew it. There are 2 sensors back there and it's the larger of the 2.
no no no do not take the manifold off. i just changed on the other day just take off the air intake tube. the sensor is up towards the top of motor. its right next to the egr solenoid valve. on the passenger side of the motor.