Automotive Service Excellence (ASE) Air Conditioner Certification 2025 – 400 Free Practice Questions to Pass the Exam

When an A/C system is opened for service, the most critical step is to evacuate it to remove moisture before recharging with refrigerant. This is essential because moisture in the system can lead to various issues, including corrosion and the formation of ice within the expansion device, which can impair the system’s efficiency and functionality.

Evacuation involves using a vacuum pump to lower the pressure in the A/C system, effectively boiling off any moisture that may have entered during the service procedure. This step ensures that the system is thoroughly dried out before the refrigerant is introduced, thus preventing potential damage and ensuring optimal operation once the system is recharged.

Once the system has been evacuated properly, it can then be recharged with the appropriate amount of refrigerant, ensuring proper functionality and efficiency. Therefore, this process is a critical part of A/C service to maintain the integrity and performance of the air conditioning system.