anybody knows of a specialist mecanic S420 1994 version in GERMANY or SWEDEN

Dear Everybody
I am very disapointed in Mercedes dealers I have a problem with my S420 W140 , on the back suspensers they are low but are not leacking but the car is
hanging, no body seems to know whats wrong but I cant imagine that this error has not occored on many 1000 cars of this model, so I am desperately looking for a specialised S mecanic in either Sweden, Germany, or France.
I also have problem with the Aircon, its not cooling anybody, and the heating take a war before it heats the car, the aircon circulation/ventilation is very slow/and not very strong, Mercedes in France really screwed me big time I went to them with the car this summer, I told them the aircon is not working, they then did examination of the car took 5 houres, and presented me with the message yes the aircon does not work, this fantastisk intelligent message cost me 210 EURO they further told me that I have to replace the whoe aircon, which is 3000 EURO.
Otherwise great car, but aftermath service from Mercedes is stinky lousy even skoda or toyota is giving better service, I paid a fortune for this car as new, and I am chocked that they are not offering a better service this is not what you expect when buying a S class car, i sincirly considering buying a lexus instead next time I have to replace my car.
So if anybody knows of a Mercedes mecanic specialist in S class w140 please let me know, I will make a website with these names.
Regards Newsman

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