My 1993 300d had evaporator replaced in 2004. No issues since and has been an extremely reliable car. My 1995 E320 is having the evaporator replaced as we speak. I am not sure about the later models being less prone to the issue.

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John Gillespie
1988 560sec - 192k miles
2006 CLK500 - 40K miles
1995 E300 - 202k miles