Letting the core dry off would make sense...

I bet the reason they fail is from corrosion because of a badly designed condensate drain...

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles

Likely. Hopefully they improved this design on the replacements.

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2004 Toyota Sequoia Limited 4wd
1991 Lincoln Town Car Executive
1991 Cadillac Sedan DeVille
1988 Mercedes 300SEL
1972 Chevrolet Caprice Kingswood Estate 9-passenger wagon
1973 Pontiac Grand Ville
(Prior MB's: 1974 240D, 1985 380SE, 1984 190D, 1993 400SEL)

Anyone seen a W140 with over 100,000 miles and a fully functional A/C system that hasn't had the evaporator core replaced in it?

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver

Jupp, my 1998 C140 with 165000km on the counter has the original evaporator.

br,
syljua

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1998 CL500 W140
1984 230E W123

My 99 has 140K on it. Original Evaporator core. Car still drives like its brand new and Im sure Ill get at least another 20 years of service out of it.