This is the only odd thing that seems to be happening with my car, occasionally after the engine is switched off, a repeated clicking/whirring noise comes from under the bonnet. It usually continues for about 5 minutes or so. Seems to be coming from a little box (VIS motors?) just behind the alternator. I tried unplugging the cable that feeds into it and the clicking predictably stopped -but I can't help thinking it shouldn't be doing it. Any ideas?