Trafic Fan Selector Switch Not Working

I am having a problem with the fan selector swith in my Trafic Van. It won't select anything anymore :(



When you try to turn it round, it feels like you are turning against an elastic or spring, then flicks back to the original position.



Since I can't put it on to demist the window, and this is winter - its a problem!



Renault Trafic SL27 DCI 100 2007









I am assuming that I can fix it just behind the switch, maybe something has broken, gotten caught up - is that right?



If so, I can't fingure out how to get behind it / remove the dash area. :o



Can anyone help?



Thanks



Paul