Thanks for the info, my problem is my center vent temp is about 37 degrees on low blower setting and about 58 degrees on high blower setting 94 degree ambient/80% humid. I have replaced the R4 with a sanden compressor and running R12,I suspect it is a dirty evaporator also air velosity out of vents is good but not great.

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84 300 Turbo / 320,000
96 E300 D / 55,000