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I think a lot of folks are missing the difference in the AC systems between the pre- and post-1991 240's. With no modifications except the oil and o-ring changes (we can even include the new hoses in this group) ht older AC system was marginal with R12. Once converted to R134a, the best you can hope for is low 50's...YMMMV.
There are a number of threads on the improvements that can be made to the older system but I have tried none of them.
The CCOT's system in the 1991+ cars has the "potential" to produce the same level of cooling with R134a as it did with R12 (1993 came with R134a anyway). None of the changes are expensive and should be part of any conversion.
I gave up on the older system now that I live somewhere that never gets really hot (in my opinion). I got my 1990 240 sedan up and running only to find that without more repairs (conversion done by a PO) the best I could get was about 58 out of the vents. It just did not seem worth it.
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