Question: I want to use an electric fan for my radiator, but do not know the proper way to wire it. Do I wire it directly to the key switch so any time the motor is running, the fan is running?
Answer: No, never wire a fan directly to a key switch. The proper way to wire your fan is to use a relay kit and a temperature sender. The temperature sender should go into the intake manifold because the intake manifold point is approximately 8 degrees hotter than the head location. The fixed temperature senders range anywhere from 180-200 degrees turn on temperature and will turn off again at ten degrees less than the turn on temperature. This temperature sender will be wired into the control circuit of the relay so when the temperature sender turns on the ground of the control circuit for the relay, it will pull in the relay for the main line to your fan.
Also, if you are using air conditioning in your vehicle, you should provide a trinary switch. A trinary switch will also turn the electric fan on at 280 psi in the high side of your air conditioner. By doing this you will not notice any difference in the temperature of the air coming out of your air conditioner. The reason you should use this switch and temperature sender is due to the fact that when you are traveling at highway speeds, there is enough air coming through the radiator and condenser to cool the car without a fan. This saves the life of your electric fan and your alternator. But then when you come into traffic at lower speeds, the motor will heat up and the fan will automatically come on by itself. Please refer to the wiring drawings below:
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