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This is probably a real stupid question but I have to ask it. I've got my new Fluidyne radiator and Flex-a-Lite fans in and now im working on the wiring. My Fluiddyne from PI came with the sensor installed in the bottom and the top with a plug. I assume that the sensor is basically just a switch that just completes the circuit when the preset temp is reached e.g. 160 deg. Can I just wire one side to the battery then the other side to the relay so that once the temp is reached the circuit will activate the relay? The relay has a ground, and a 12ga wire with 30amp fuse to the battery, and another 12ga wire to the driver side fan. I wired the passenger side fan to come on with the ignition switch as Jack recommends. Of course with a separate relay and fuse. As Jask also recommends I'll hook up the switch in the console to the second fan if the sensor ever fails.

Thanks all
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You should use the relay to operate the fan, the sensor is probably not designed to handle the load of a fan motor starting. If the sensor has 1 connection then connect that to the relay coil and connect the other coil connection to the wire with the fuse to the battery. Connect 1 fan lead to the relay “contact” and the other relay “contact” to the wire with the fuse to the battery. The other fan lead should connect to ground.
All seems well so far. I also changed the thermostat to a 160 deg and filled every thing up, blead the air and it idled for over a half hr with only one fan. It never got hot enough for the second fan to come on with the sensor but I turned it on with the switch just to make sure it worked. It's still pretty cool here in SF. Hope this solve's my overheating problem. Bring on Las Vegas. Thanks Jon for your help.
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