So my radiator went recently so I replaced it yesterday and then when I went to make sure everything was fine i noticed that the cooling fan did not come on. I tested the fan by hooking it up to 12v and it worked fine so i know the motor is good and i checked all the fuses and relays. I replaced the ECT sensor and the fan switch but still nothing happens. My AC fan goes on fine but my cooling fan will not turn on unless i close the circuit my self either through the fan switch or relay. What could be the issue? Also im not sure if this is the right place to post this. Thanks for your help.