Larry,

Re diagnosis, yes, a very reputable indie shop diagnosed it as a hole in the evaporator. They even used the phrase 'large hole," which surprises me since it's still blowing cold after a number of months.

Re the $135, that wasn't just to top off the R134, but to evacuate the system, leak detection service, etc.... My hope was that they would simply add the pound of R134, but they wouldn't.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife