What is the first step when servicing an air-conditioning system that has lost all of its freon?

The first step when servicing an air-conditioning system that has lost all of its freon involves checking the oil and adding it as necessary. This step is critical because the refrigerant cycle relies on the presence of both refrigerant (freon) and oil for the system to function correctly. When freon is lost, it may also impact the lubrication of the compressor and other components, leading to potential damage if not addressed prior to introducing a new refrigerant charge.

Assessing the oil level is important because the compressor requires proper lubrication to operate effectively, especially after a significant loss of refrigerant, which can also remove some oil from the system. By checking the oil first, the technician can ensure that the system is adequately lubricated before any further actions are taken, such as adding freon or checking system components.

This approach prevents damage to the compressor and supports the integrity of the air-conditioning system during the servicing process.