My cooling fan will not turn on please help,

First take a short jumper wire, across both wires going to the temp switch on the radiator, basically connect the two wires together. If it comes on, then you have a bad temp switch.

Test the fan directly with a pair of your own wires from a 12 volt source like your car or bike battery. If it seems ok, and does not get hot!----then your relay or your coolant temp sensor is at fault. Are you sure you are full of antifreeze/coolant??? Sometimes the wire is tiny and gets snagged and pulled off the sensor or disconnected in some way. Try these, and good luck!!! PLease rate me a FIxya if you think this was the most helpful. Post if you need more advice. Good Luck