For the three Alfettas we owned and drove for thousands of miles we never had an overheating problem. The only Alfa we had this problem with was the 89 Milano, which did overheat in Phoenix big time, but not anywhere else. We drove our new 78 Alfetta GTV clear across the country from DC to Seattle, and for several years later, with nary a hint of any such problem.
The question remains, is a change necessary?
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6