How to Determine If a Car's Air Conditioning Lacks Refrigerant Oil?

[McVivian]

When the refrigerant oil level in a car's air conditioning system is insufficient, the air conditioning compressor may exhibit abnormal noises or overheating symptoms. Below are the methods for adding refrigerant oil to a car's air conditioning system: 1. Direct Pouring: The direct pouring method simply involves opening the compressor's plug port and pouring the refrigerant oil directly into the compressor. 2. Vacuum Suction: (1) Evacuation: Use a specialized vacuum tool to extract the air from inside the air conditioning system. (2) Negative Pressure Suction: After the air inside the air conditioning system is extracted, use negative pressure to draw the refrigerant oil into the compressor through the yellow hose. (3) Adding Refrigerant: Once the refrigerant oil is completely drawn into the compressor, the addition of refrigerant oil is complete, and then refrigerant can be directly added.