My 02 here. On the 190E, the evaporator (behind the dash) is actually easy to replace (if thats your problem) as there is a sub panel in the engine bay that gives you easy access to the unit. This is not true for the W124 owners, who would need to have the entire dash pulled to have the evaporator serviced.
The evaporator is a common failure point on the AC systems, so its worth investigating.
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