I have a very elusive AC leak. Not a big leak mind you but still a leak. I loose about 3 Oz. of R134 per month. That about 10% of the total capacity of the system. I've added UV dye, and still can't find the leak.

So here is my question. Using a UV Light, I checked the Condensate water dripping from the evaporator onto the driveway for traces of UV dye. No trace of UV dye found, the condensate was clear. Does that eliminate the evaporator as being a potential cause?

Don't know where else to look.

Thanks

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