Ironically, this liquid in the receiver could becausing the problem, particularly when the equipment is in a hotenvironment. Blends could show flashing for the samereason, however, they can also flash when there is plenty of liquidin the receiver. If one of the traditional refrigerantsshowed vapor in the sight glass it often meant there wasn't enoughliquid refrigerant being fed to the valve, and more refrigerant wasadded to the system. There are several reasons forbubbles in the sight glass. In an auto, it is not unusual to have afew bubbles in the sight glass unless you're driving or have a bigfan forcing ais across the condensor. It couldmean you are low on refrigerant, or the high side temp is too high(blocked condensor maybe). On the highpressure side, bubbles simply mean not all the high-pressurerefrigerant has condensed. Good luck!Actually, the bubbles could be completely normal. This ismost likely at the suction of a pump or compressor. Other systems would be were you are drawing a vacuum. If it isyour air conditioner, then you most likely have a cooling coilleak. Bubbles normally means air intrusion into a system.
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