Ken thats what I was thinking. If I had a W140 and the evap went I would just take a long weekend and figure it out. It ain't rocket science just take your time and take a lot of notes. I'd also replace it with the copper core.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Not exactly a DIY, but lots of pictures from a change
of heater element on a S500 (in german);

http://community.forenshop.net/forums/index.php?mforum=W140&showtopic=1847

br,
syljua

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1998 CL500 W140
1984 230E W123