The squeaky wheel theory
A couple years back I replaced the entire AC system on my 1987 190E, compressor, condensor, drier. I went to an independant AC shop and they got MB parts from the dealer. After 11 months 2 weeks, the compressor went. The replacement of the compressor, new drier, and labor was $1000. Since the compressor was under the 1 year warranty, MBUSA paid the entire bill including the drier and labor. Sometimes all you have to do is ask.