DIY R134 conversion.
1. 1988 W124 300E, new compressor, receiver drier, expansion valve, all O rings. Converted to R134. Fully charged, no leaks. Low side, 55psi @ 90F ambient. Vent temps only 66F
2. 1987 Peugeot 505, converted to R134 last year, Ambient 90F, vent temps 46F
How can I improve the Benz's temps without going to R12?