My 02, I went down the road with a trunk evaporator mainly because the aircon in a GTV I had way back never worked worth a flip. My thought was the under dash evaporator was to small and the piston compressor was always breaking mounting hardware. As I remember Vintage Air made the kit but didn't have a condenser that fit. I had to get that from Classic Air. We've been sitting under a massive high pressure system, perfectly clear blue sky and temps above 100deg F. I've been able to drive in relative comfort and the water temp is normally 175 and on the hottest days will creep up to but not past the mark just past 175. Without the aircon the car would be un-driveable.
The passenger seat is 15 miles an hour faster than the drivers seat.
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale