What are technicians required to do before recovering refrigerants from an MVAC system?

Technicians are required to evacuate all air from the MVAC (Motor Vehicle Air Conditioning) system before recovering refrigerants. This step is crucial because air contains moisture, and the presence of moisture in the system can lead to the formation of acids that can damage the system's components and reduce efficiency. By evacuating the air, technicians ensure a clean and appropriate environment for refrigerant recovery, which helps maintain the integrity and longevity of the air conditioning system. This practice is a fundamental part of ensuring that the recovery process is safe and effective, aligning with environmental protection measures mandated by the EPA to maintain proper handling of refrigerants.

While the other options may seem relevant in different contexts—like ensuring the system is well-maintained, being aware of any leaks prior to servicing, and keeping accurate service records—they do not directly pertain to the required procedure before the refrigerant recovery process itself.