all that stuff backs up at the orifice tube because it's an --- orifice --- that reguates the flow of refrigerant thru the system. Looks like it may be bits of aluminum compressor shrapnel.

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Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320