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.