Need help understanding when the cooling fans on this car should run. I do not have a Toyota service manual, but I do have a Chilton manual. It states that the fans should run all the time at a low speed and at faster speed when the A/C is on. I have replaced the ECT switch, located in the bottom of the radiator. The fans do not come on with that switch plugged in, but they do come on when that switch is unplugged. Why is that? Any help greatly appreciated.