Just as a point of data from another M119 owner (albeit a measly 400E), I've never been really happy about my car's cooling ability in stop-and-go traffic, despite having a completely functional (now) aux fan system and the Stu Ritter constantly-engaged engine fan.

However, once on the freeway, I get plenty of cold air. Even in mid-90 temps with high humidity, 5-10 min on the interstate and my cabin fan is able to slow down and the cabin is quite comfortable. Soon as I hit my exit ramp and get into traffic, though, it's back to just-barely cool enough.

Have you checked to make sure your condenser is free of bugs, etc.? Airflow up front seems to be a major issue for these vehicles.

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Steve
'93 400E