First of all, don't let the "Mercedes" part throw you off. AC is AC, pretty much though there may be specifics on wire routing, pressure switch type, etc. that are specific. So basically, any AC shop worth their salt ought to be able to sort this out for you. Living here in the SE, AC is a critical function and pretty much any decent repair shop does a good job with AC. Worth asking friends, co-workers, etc. for their experiences with any given shop. Because specialized equipment and skills are needed, I shop AC work out to a friend's shop. I simply would never do enough of it to justify the equipment unless you want to make it a side job (a friend in MI did that).

Dan