What should be done after checking oil when servicing a vacuumed air-conditioning system?

The correct action after checking the oil in a vacuumed air-conditioning system is to evacuate the system. This step is crucial because it ensures that any moisture or contaminants present inside the system are eliminated.

When an air-conditioning system is serviced, maintaining its integrity is vital for optimal performance and longevity. Checking the oil is a preliminary step to confirm the oil level and quality, indicating proper lubrication. After ensuring that the oil is satisfactory, evacuation is necessary to create a vacuum environment within the system. This process removes air and moisture, which are detrimental to the efficiency and operation of the air-conditioning system.

By evacuating the system, you help to prevent issues such as refrigerant breakdown, corrosion of internal components, or formation of ice, which can occur if moisture is present during operation. Following this procedure with the right charge of refrigerant will then allow the system to work effectively, demonstrating the importance of sequential steps in servicing air-conditioning systems.