Hello everyone newbie here very helpful info listed thank you. Last year disassembled and flushed AC system, new compressor, orifice tube, accumulator. Vacuum could not hold very slow leak. Couldn't find leak with sniffer or UV dye. Recharged AC had great air and took to mechanic and they vacuumed and recharged did not find leak. Had good AC all summer. Stored winter. This spring no air. Should I refill AC using old accumulator and drive to get UV dye to leak out - how long? Will it harm system with old accumulator running? Don't want to kill compressor. Trying to be a DIY and save cash. New mechanic? These guys are honest and very fair. Trying to understand AC but leak is driving me nuts! Great car. Please help.
You'd have to weigh the cost(s) and make your own decision.
New compressor rules out shaft seal, which was my first guess. But technically, a new compressor always commands a new receiver-dryer. There are some specially treated PAG oils that can help small leaks, but require at least a partial charge to inject. If it's a new "accumulator" as you call it, it should be fine to continue running it. but I would certainly double check every connection you had to loosen in order to replace those components.
Also, did you sniff of examine the valve cores on both high and low fittings? Another notorious spot for the "impossible-to-find" small leak.
And no matter how silly it sounds, try your UV search at night. (One neighbor is still quite suspicious of me, albiet this practice admittedly not the only reason...)