coolant temp sensor bad?? HELP!!

[Ksan]

Hey guys i was just wondering, i start up my car let it idle to operating temp, and my raditor fan does not kick on. I took two 16 gauge wires, connected to the fan str8 to the battery and the fan kicks on. Im not over heating because i let my car run for 1 hour and a half and it did not over heat. My guage works, all the fuses are good, i swap relays and still the fan doesn't kick on. Is there anything im missing or can someone help me?

[BrokenTalon27]

Check for a short in the wiring.

[JDMxDB8]

Check your fan switch and thermostat.

[thundernoodle]

My thermostat was broken and I had this problem. Got a new thermo for $20 and I fixed it. But not in time to save the head gasket from going lol. milky oil ftl.

[Ksan]

true, well when i put back the motor when i was building it, i put a new water pump, thermostat, and all the working sensor off my old motor.

[Ksan]

also guys come to find out i jumped the raditor fan switch sensor it kicked on. so i assume the sensor was bad and i bought the sensor at work. I installed it, and still the fan doesn't kick on. =X