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How to find AC leak in '90 240 200 1990

I have a '90 240 that I want to convert to 134a. I purchased the o-ring set from FCP, but need to find the leak that caused the R12 to leak out first. I used a UV light from work (wavelength unknown) to search for any dye fluorescence from a can of 134a with dye, but couldn't find any. How do I locate the leak so I can change necessary parts while changing the o-rings?






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