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Dye may or may not hurt or clog up stuff... but is totally useless with regards to a leak in the Evaporator... thus only a Sniffer is the gold standard.
It is legal to test for leaks using a sniffer with nitrogen and 4 oz of R22 and release into the atmosphere... according to the EPA... they figure that is better than people charging up leaking systems only to lose more than that in the long.. .or shorter run.
Your system needs to be checked pressurized.. that is the way the seals are when working... vacuuming is for the moisture removal.
Nitrogen ... in addition to the pressure checking procedure is used to remove moisture also... triple evacuation on home systems is pretty standard... the dry nitrogen takes up some moisture.. you take it out... repeat.....
check out the AC reference threads in my signature...
Duracool is a BLEND.. thus later if you need to top off the system... all must be removed and filled with new....due to blends leaking their parts at different rates...
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