What is a common indication of internal leaks in an MVAC system?

Unexplained loss of refrigerant is a crucial indicator of internal leaks within an MVAC (Motor Vehicle Air Conditioning) system. When there is a leak, refrigerant escapes from the system, leading to a decrease in the overall refrigerant levels. This loss can often manifest itself through inadequate cooling performance, as the system relies on a specific amount of refrigerant to function efficiently.

A sudden drop in cabin temperature may indicate other issues such as temperature control problems rather than directly pointing to a refrigerant leak. Increased compressor noise can suggest mechanical problems but does not specifically indicate the presence of a leak. Visible frost on components might suggest inadequate refrigerant levels or issues with airflow but does not definitively confirm an internal leak without additional context. Therefore, the unexplained loss of refrigerant stands out as the most direct and reliable indication of internal leaks in the system.