I just had a 3 K evaporator job done to my 1994 S-500. The Receiver/Drier shows very few bubbles at startup but it also shows slightly cream colored with a slight green tint from the leak detection dye. The AC shop removed the freon, weighed the charge, which was exactly the right amount and evacuated the system again. After recharge the glass remained cloudy. They say nothing is wrong and in R-134 systems the sight glass should be ignored. They did say when they over filled the system by .3 lb. the glass cleared up but the pressures went too high. Do I have anything to worry about?? During the evaporator replacement, the expansion valve and the Receiver/Drier were also replaced.

Thanks,
Mark