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?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

keeton holifield · Accepted Answer

Final Answer : C, Explanation :  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.

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