my fans started to to come on all the time,now they are alway on.then the stop light came on but the car runs fine.i changed the 3 sensors on the thermostat housing but never made a diffrence,so i then changed the bitron sensor(fan control unit) the other day,and the stop light went off but fans still stayed on.but a week later the stop light is back on again and fans still on. can anyone help? thanks

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tmiller