You need to evacuate the ac system before removing the compressor. the compressor isnt a bad job but make sure you can evacute the freon and get some more r12 freon and the right compressor oil.

However mercedes a/c is known to be buggy and known to break many times so its your call.

The problem with your ac maybe somewhere else,ie evaportor, condensor, expansion valve. its a lot of work to get the evaportor if it indeed it is the evaportor.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)