Technician A claims that evacuating an A/C system removes air and moisture. Technician B claims it also removes dirt particles. Who is correct?

The assertion made by Technician A is accurate. When an A/C system is evacuated, the process primarily aims to remove air and moisture, which are detrimental to the system’s performance. Air can cause the system to operate inefficiently, and moisture can lead to acid formation and component failure. By creating a vacuum, any air trapped in the system is expelled, along with moisture that can condense and create issues over time.

While it is true that dirt particles can be present in an A/C system, the standard evacuation process primarily focuses on air and moisture removal. Dirt removal typically requires different procedures, such as flushing or using filters within the system. Therefore, Technician B’s claim that evacuation removes dirt particles is not entirely accurate, as it is not a primary function of the evacuation process. This distinction is crucial for understanding the operation of A/C systems and ensuring their longevity and efficiency.