Yeah, could be relay, fuse, thermoswitch. Probably more likely the relay or thermoswitch.

Like said above, just swap the AC condensor fan relay into the radiator fan relay position and then see if it comes on. If it does, you know it's the relay.

You can remove and test the switch as well, or you can just pick up a new one.

So even after the car warms up, the fan doesn't come on?

Is the car overheating?