I have a 92 300D with a hole in the evaporator. I charged it up with R134 in December and it blew cold through August. My question: Am I safe to let it go until it gets hot again (April here in Texas!) or is it advisable to keep it charged throughout the winter to prevent moisture from getting into the system?

Thanks.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Some of the R134 oils are quite hygroscopic. It's probably better to get if fixed sooner rather than later.

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Norm in NJ
Next oil change at 230,000miles

you should not only fix it because of the sysyem being open to moisture (future problems a certainty) but also because in the wintertime you will be more apt to use the windshield defrost function which works best in conjuction with your a/c