A/C compressor general question

[dmtinker]

I just got an 82 300SD and the A/C is a bit "cool" not cold. I haven't checked to see if the PO had converted it to 134a or if its still R12. I was told when I picked it up that the PO had "toppped" off the freon. I know that 134 does not compress as well and if you have done an upgrade, you sometimes don't get the best performance. This is especially true if the compressor is small to start with.

My question is, how good is MB A/C to start with? Not all factory A/C is very good. If its a small compressor, should I go with something like freeze12?