A customer reports that the cabin is too cold while the A/C system is running continuously. What is a likely cause?

When a customer reports that the cabin is too cold while the air conditioning system is running continuously, a likely cause is a failed thermostat. The thermostat is critical in regulating the temperature within the cabin by controlling the operation of the air conditioning system. If the thermostat fails, it may provide inaccurate temperature readings or malfunction, causing the system to run longer than necessary. This can result in the cabin becoming excessively cold, as the system continues to cool without properly responding to the actual temperature.

In contrast, clogged air filters can restrict airflow and generally would lead to insufficient cooling rather than excessive cold. Low refrigerant levels typically result in reduced cooling efficiency and may cause the system to freeze, but not necessarily create a situation where the cabin becomes overly cold while running continuously. A faulty compressor would likely cause the system to fail to operate correctly, possibly leading to inadequate cooling rather than excessive cold. Thus, a malfunctioning thermostat is the most straightforward explanation for continuous cooling leading to an overly cold cabin.