1993 300e with 134 freon. Holds a charge and blows cold for about a month.

Where do I start?

I've heard talk about a dye used to find the leak. Where do I buy that? UV or non UV? Then I suppose replace the O ring thats bad if I'm lucky, evacuate and new dryer?

I feel lucky owning the only Mercedes car in this small Kansas town! NO one wants to help!

Comments appreciated.

was retrofitted?

Yes you need a dye and uv light to see the dye, you can also an electronic leak detector as well. to properly diagnosis ac problems hook a appriotate manifold gauge and read the pressures. It reciever driers dont usually leak its usually the seals and retrofit conversions that leak.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)