Thinking back, my MB never had really cold air...and I think that is pretty common, at least on the 560 SEL models and other models of that era. But yes, it did seem to me that the AC was even less cold for the past few years since the R134 was put in. I probably rationalized this as just standard MB "not very cold AC". After they recharged the system today the air was blowing much colder than it had been....probably because the system was low on R134 because of the slow leaks through the R12 hoses as has been mentioned in this thread. Needless to say, I was not happy finding out that I had been converted to R134 without my permission.

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1986 560 SEL (159K miles)