A malfunctioning compressor in an AC system typically results in:

A malfunctioning compressor in an AC system often leads to the production of warm air, even if the refrigerant level is low. The compressor's primary function is to circulate refrigerant throughout the system and maintain the necessary pressure differentials for heat exchange to occur effectively. When the compressor is not operating correctly, it fails to pressurize the refrigerant adequately.

Consequently, low refrigerant levels can exacerbate the situation, but even with normal refrigerant levels, a faulty compressor wouldn't be able to cool the air effectively. Instead, it would result in warm air being blown out of the vents, as the system is unable to complete the refrigeration cycle necessary for cooling. Therefore, the observation of warm air, regardless of refrigerant levels, highlights the compressor's essential role in the AC system's cooling capability.