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Message: <blockquote data-quote="Doitright" data-source="post: 2174290" data-attributes="member: 348405">I have a 2000 Toyota Sienna.  In August of 2008 I replaced the condenser (dealer traced refrigerant leak to that part).  The a/c worked fine afterwards...till now.I added dye and refrigerant, only to hear a hiss definately coming from the front. I couldn't find the leak as at the time I didn't have a black light (that illuminates the dye).Holding it to the condenser and connections, I still couldn't see any sign of the leak.Question: Does the vehicle have to be running, and actively "leaking" to see the dye with the black light?I bought a black light and held it up to the parts. a few days after adding dye.</blockquote>