How do you diagnose a non working fan motor on a 1996 E-150 - it isn't the fuse?

check the relay and if that is good turn on your a/c and see if the fan is running if it is then replace the temp sending unit to the fan trace the wires to the fan itf it electric if not and it is a clutch fan then replace with a new clutch fan or a straight fan that cools all the time