most obvious is you dont know how to work on cars,its ok, niether do I. sounds like youve replaced a few of the things already that would cause problems and if your fan is still not working then its very possible the relay switch to it is not telling it to go on, or when it does the actual wires that power the fan arent working, if you dont own a multimeter for testing the power take it to a mechanic have him test it, pay him to test only and diagnos, then fix it yourself if you can,these are things that just plug in sometimes, if it takes real mechanic skill to fix then pay the man!