The A/C evaporators were never fixed on W140s, they all have the same problem: a mix of copper and alluminun alloys which is what makes them leak. There is an aftermarket all copper evap that can be mounted to change the original factory unit. If the evap was or is changed at the dealer, it will be the same problematic unit.

49K sounds reasonable for a 1997, if it is in top shape, I will definitely go for it. Don't worry about the transmission, by then the 722.6 worked almost flarlessly and you just have to be sure to change the oil. Be sure the self-closing pump is working properly and all electrics work accordingly.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]