Hiya.
I just had exactly the same fault like you describe.. a little heat still there BUT no blower.. re miff121's message - he's spot on.
The part from fiat is approx £180 so get to the breakers and you'll find one no problem for a fiver. In the passenger footwell you'll see the fan motor casing. Behind this there is a fag packet sized object with 2 connections on 1 side and aluminium cooling fins on the other side. 2 screws hold this up in the footwell. Remove these and the offending item will fall down into the footwell or into your pocket
It may be better to even just cut the wires instead of removing the connections as one of yours may be partly melted and you might want to replace it..
Hope this helps you - ALL I CAN SAY IS WHAT A RELIEF TO HAVE HEATERS AGAIN!
Regards
Rascal808