It will be in the fuse box under the hood. It will say something like RAD FAN or it might be with a few things. If the fans not working it could be the the switch. An easy way to make sure the fan is working is to turn of the AC. Whenever the AC is on the rad fan will come on too. Use this to also test the relay and the switch.
FYI: You also can wire the fan to always run when the car is on by bypassing the switch.
Good luck.