Technician A says that bubbles can be seen through the sight glass on an R-134a system even when it is operating normally.Technician B says that many R-134a truck A/C systems are no longer fitted with sight glasses.Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because bubbles can indeed be seen through the sight glass of an R-134a system under certain operating conditions, such as when the system is not fully charged or during initial startup. Technician B is also correct because many modern R-134a truck A/C systems have moved away from using sight glasses due to advancements in system design and diagnostics, relying instead on pressure gauges and electronic diagnostic tools.

Technician a Says That Bubbles Can Be Seen Through the Sight