Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.
I've read where people have used the C4 fan motor which has increased volume capability but also requires a spacer between the fan and the firewall. If they recharged your system with R134a, then that would explain some of the lack of cooling because the system was not designed for it. Another possibility would be some type of clogging in the expansion valve system. Assuming the system is charged with R12 and the operating pressures are correct, I would suspect something of this nature.
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Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982