Pretty common, there are various tests you can do to determine the fault....
1) Check the fuse in the Fan Control Module under the header tank
2) fan position switch usually can cause problem, so after you've checked the fuse, bridge the pins on the plug, this controls fan speed 1 / 2.
3) Speed 3 is controlled by the black plug on the thermostat housing.
4) There is also an "after-run" which is operated from the yellow plug (also operates the Aux pump and temp gauge).
If you don't see any signs of movement then you could either have a faulty FCM or your fan motor is dead.
I believe