What is a symptom of air or noncondensable gases in a capillary tube air conditioning system?

In a capillary tube air conditioning system, the presence of air or noncondensable gases typically leads to an increase in both suction and discharge pressures. When noncondensables are present, they occupy space in the system that would otherwise be filled with refrigerant vapor. As a consequence, the compressor has to work harder to pump the refrigerant, leading to an increase in suction pressure. At the same time, the discharge pressure also rises due to the additional resistance created in the system.

This situation can affect system performance significantly, as the air or noncondensables prevent proper heat exchange from occurring, leading to inefficient operation. In contrast, the other options reflect symptoms that do not accurately portray the effects of noncondensables. High suction pressure combined with low discharge pressure, low suction pressure with high discharge pressure, or low suction pressure and low discharge pressure do not align with the expected behavior of an air conditioning system affected by noncondensable gases.