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What do bubbles in a sight glass indicate?

  1. An overcharged system

  2. Insufficient liquid line subcooling

  3. TXV with an excessive superheat setting

  4. Evaporator coil icing

The correct answer is: An overcharged system

Bubbles in a sight glass indicate that there is a presence of refrigerant vapor entering the liquid line, which can be caused by an overcharged system. When a system is overcharged, there is an excess of refrigerant in the system, leading to a decreased subcooling in the condenser. This results in the refrigerant not fully turning into a liquid form in the condenser, leading to the presence of bubbles in the sight glass. Monitoring the sight glass is crucial to ensure the proper functioning and efficiency of the air conditioning system.