Unknown switch on dash board

[KKson]

Hi all, I put a few miles on the 390SE over the weekend - all good apart from a fairly major leak from the rear gearbox oil seal which I'll need to sort soon.

One question but there's a switch on the dash board that appears to do nothing at all. Any clues as to what it should or used to do? I'm guessing maybe a manual switch for an electrical aerial?
Thanks.

[KKson]

Thank you for the useful comments - I certainly don't need a switch for fart fog, just a few pints of Scrumpy!

Sidelights, head lights etc are controlled via switch on steering column. Unknown switch in question doesn't seem to do anything at all. There's a broken flexible aerial where an electric used to be so can only guess it is an old manual over ride? I may well rewire it as a main fan override switch however - sounds like a useful upgrade which I've already done for the 350i. Cheers.

[KKson]

Thanks for all responses. I'm fitting a new aerial at the weekend as the old one has broken off but it will be a fixed and short flexible one as the rather large subtle SEAC style spoiler doesn't allow for an electric pop up aerial.

I very much like the idea of using the switch as a cooling fan manual over ride switch.

Cheers.