Hmmm,
I have either the same or simular problem atm with my 147 GTA, I dont notice any difference running around town in temp. But as soon as I get it on to a streach of road. The water temp goes up to just under 100deg, the problem apparently is the v6 motor water pump has a plastic impellar which is known to failed and will cause this issue.
Check these
(Pics of wat im talking bout)
AHM Alfa Romeo Servicing & Repairs
http://www.alfaowner.com/Forum/alfa-...mp-change.html (Waterpump change)