Auxiliarry fan

[sv1cec]

OK guys here is a strange one for you.

While in Ukraine, I did some maintenance work on the X5. The mechanics at the shop were great and the prices were great, so I took advantage of them and fix several things that needed to be fixed.

However, the electrician, next door, which the shop used for all things electrical, was a crook. He tried to get money out of things that weren't necessary, both from me and my son (he also has an X5).

Now, during one of my visits to the shop, he run a diagnostic on the car, and he told me that my aux fan is NOT working. That was strange because I've checked the car for errors a few days ago, and there was nothing in the memory (well, nothing that I didn't know, like the glow plug in cylinder 5 that needs to be replaced, but living in Greece, I do not think that it is necessary). Also, a couple of weeks ago, the car has been checked by BMW Bulgaria and the fan was not mentioned. So :

1. the fan went south between the previous time the car was checked and when he checked it.
2. The electrician was pulling my leg, with a temp error which never appeared before.
3. During the work that the mechanics did on my front suspension, they have disconnected something that controls the fan.
4. The fan is indeed not working (to be honest, I've never seen it working, but I am not sure when the bloody fan is supposed to work. Temps were not high enough to warranty its engagement). Temperature gauge never went above normal.

So I guess what I need to know is how can I check and make sure that the fan indeed is not OK. What other things I need to check before deciding that the fan is bad?

Also, what module should I check for errors, to see the exact error the electrician saw?