After the 4th failure of the fan switch and subsequent replacement of hvac units in my 2011 ducato as fiat wont/dont supply the switch as an individual unit and also thanks to the people on this forum ive found that a fiat punto fan switch does indeed fit . Ive also gone and fitted 4 relays to the system to take any current drawer away from the switch itself through trial and error i found more than 20 amps being drawn through it hence why the switch burns out .Hope this helps someone cheers Adam