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

After checking the oil in a vacuumed air-conditioning system, the next step is to evacuate the system. This process is crucial because evacuating removes any moisture and non-condensable gases from the system, which can lead to inefficiencies and potential damage to the components if not addressed. The evacuation process typically involves using a vacuum pump to lower the internal pressure of the system, ensuring that it is as empty as possible before any refrigerant is added. This step is essential in maintaining the integrity and performance of the air-conditioning system, allowing for proper operation once it is charged with refrigerant.

Evacuating before charging the system helps maintain efficiency and longevity, as contaminants and moisture can significantly impact the overall effectiveness of the refrigeration cycle.