Radiator fan not working.any ideas?

Changed the temp sensor and it still doesn't work… Checked relays and fuses, still doesn't work! The fan works cause i turn it on manually and cools the car, could it be the thermostat? If its not that, what can it be? I checked all fuses and relays in the fuse box, is their somewhere else i should be checking? Ford mustang V6 2005… It started over heating ever since my temp sensor popped out, so i figured it got damaged when that happened, but i put a new 1 and it still don't work(fan)

You probably have more than one temp sensor. One for the ECU, one for the gauge (unless that comes from the ECU) and one for the fan. That sensor will probably be labeled "fan switch".

Make sure you're getting a good connection at that connector. What happens is that when the fan motor ages through constant heating and cooling, it creates higher resistance in the windings and requires a bit more amps than it previously needed. This in turn will cause the weakest connection to over-heat and warp the electrical terminal and housing causing an even worse connection. It may not be your exact problem but it's certainly the most common. Please also note that it does take a long time for an engine to reach the temp needed for the fan to come on and also if there's trapped air in your system that it may be preventing the coolant from touching the sensor thus giving it a cooler reading than it actually is.