When you replace the AOS, replace the hose that connects to it (not the little bellows that's on the bottom of the separator). Mine had a small crack in it and that is what caused the squeal after I replaced the bad AOS .
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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Threaded Mode
