Time to service/repair AC?

Since I am going to change the timing chain on my 380Sl soon, maybe start this weekend. I am also think in fixing the A/C system It seams to kind of work but it does have a leak at the back of the compressor. I think the o-rings on the manifold are blown out. What other parts of the AC system should be changed once I open the system up? It has previously been changed to the R134 freon. Getting to the back of the A/C compressor look to be more of a job then changing out the timing chain.

[airedale]

R-134 just does not work as well as R-12, maybe 15% less effective. There are a lot of threads under tech help on this forum that deal with AC. AC is really not a DIY job in most cases.

You are correct R134a really does not work as well as R12. Much higher head pressure. But since that is what is in there now I will go back with it. And Yes AC work really is not for Most DYI people. However I have installed many R134a systems in aircarft so it should be no issue on the car I have teh AC certivaction and the gauges so it should be no issue. Just need to get it evacutated first