Nothing is seen in the sight glass (R-12 system). Technician A says that the system may be completely empty of refrigerant. Technician B says that the system may be completely charged. Which technician is correct?

Question

Quizplus · Accepted Answer

Both technicians A and B are correct because when nothing is seen in the sight glass of an R-12 system, it could indicate that the system is completely empty of refrigerant (supporting Technician A's statement) or it could also mean that the system is fully charged and there are no bubbles present to see (supporting Technician B's statement).

Nothing Is Seen in the Sight Glass (R-12 System)