Which of the following can result in low superheat in an A/C system?

Low superheat in an air conditioning system indicates that the refrigerant is not being adequately heated in the evaporator, which can lead to inefficient operation and potential system issues. When there is too much refrigerant in the system, it can create a situation where the liquid refrigerant does not have enough time to evaporate fully in the evaporator coil. This causes excess liquid refrigerant to flow back to the compressor, leading to low superheat readings.

In a properly functioning system, the refrigerant should absorb heat and change state from liquid to gas before returning to the compressor. However, if the liquid refrigerant volume is too high due to an overcharge, the evaporator is unable to vaporize the refrigerant completely. This condition results in low superheat, as the refrigerant entering the compressor is not fully vaporized, which can ultimately lead to compressor damage if the situation is not addressed.

The other options, while they may relate to other system conditions, do not directly cause low superheat in the same manner. For example, too little refrigerant typically results in high superheat because there is insufficient refrigerant to absorb heat efficiently. A clogged liquid line would generally lead to flow restrictions causing different systemic issues rather than specifically causing low superheat