Car is a '95 E300D, 124 Body (same as an E320). I have a relatively sloW AC leak, whose source I can't find either with a sniffer, or with a UV Dye. Logically I would have suspected the evaporator as the cause, as i know that its a common problem on these models. BUT, If the compressor is OFF, such as it was most of the winter, then the leak is rather very slow, In fact the compressor is still working after I filled it back about 4 month ago. I do however see lots of bubbles, so I am sure that I am missing some R134. probably still have about 1/2 capacity left. However if I run the compressor, then it will stop working after about 10 days, meaning that most of the R134 would be gone.

My question therefore is the following: With the compressor OFF wouldn't the pressure in the evaporator be much higher then when the compressor is ON. So if so, had the leak been from the evaporator, shouldn't I expect it to leak faster when the compressor is ON instead of OFF.

Am I right in my assumption? Based on what I described, can I therefore dismiss the evaporator as a possible cause of the leak?

Any thoughts?

Thanks

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'95 E300 Diesel, 264,000 Miles. [Sold it]