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TONS of DYI conversions out there Matt -- fittings added via a new hose(s) and off they go without ever replacing anything but the charge. No decals, no new drier, etc - even though it should be flushed, usually a larger condenser added, o-rings replaced, etc. My point is lack of a sticker isn't conclusive. However, if someone added the quick connect fittings - the only logical reason for doing that was because they wanted to add 134 via DIY WalMart cheap refrigerant.
Suspect it's all moot though -- that thing doesn't look like the hood has been up in......well, forever.
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