I finally have Ac!!!! First and foremost I would like to thank Vstech aka John. The GURU of AC on w123!!!!!!
He was a huge help through the process of answering any questions I might have. My system was all original with the r12 valves still on the hoses. Basically, I replaced the r4 comp with a new 4 seasons r4 and the drier. I didn't have the tools and machine to do the job so my local mechanic neighbor did it for me with my guidance.... flushed the system and vacuum i went lwith 134a as I don't have access to any r12 at the moment. The original condenser and expansion valve and switches on the drier and it works fine.
Now, the issue I have is that most mechanics here in the US have no clue about mercedes cars, let alone a diesel benz. I have seen this first hand for the past 30 plus years I have owned a diesel mercedes. Having to tell your mechanic what he is doing wrong and paying him on top of that is just something I find difficult to accept but thanks to this forum and the info you gain from the the posts is invaluable.