just dont worry about it. It will know when its too hot and need more air flow. Leave it alone.
The temperature sensor is on the passenger side of the radiator, it screws into the front side. Mount a single pole, single throw toggle switch where it will be handy for you. Locate the two wires leading to the sensor, and tap into each of these with two seperate wires long enough to reach your switch. Don't cut the factory wire, just use a razor blade and strip some insulation off. Then wrap your new wire around a couple times and solder each connection. Then you can either tape the connections tight or use liquid tape and brush it on. Liquid tape once dry is as good as heat shrink.
Now run both wires to the switch and connect one to each side.
With this done... when the switch is off you will have normal fan operation with the temp sensor, with the switch on it will bypass the sensor and the fan will run constantly. That way if you forget to turn it on, it won't smoke your motor.
Hope this helps, let me know if you have any questions.