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What are the methods for adding refrigerant oil to a car?

2 Answers

BennettMarie

07/24/25 9:14am

The refrigerant oil can be added to the car's refrigeration system without vacuuming; as long as sufficient high pressure is applied to the refrigerant oil, it can be injected into the refrigeration system. Here is more relevant information: 1. Key point for addition: When adding refrigerant oil under high pressure, air must not be allowed to mix into the refrigeration system; air is a non-condensable gas, and if it mixes into the refrigeration system, it will cause the exhaust temperature and pressure of the refrigeration system to rise, reducing the cooling effect. 2. Vacuum suction method: Use a specialized vacuum tool to extract the air inside the air conditioning system. Once the air inside the air conditioning system is extracted, use negative pressure to suck the refrigerant oil into the compressor through a yellow hose. Once the refrigerant oil is completely sucked into the compressor, the addition of refrigerant oil is complete, and then the refrigerant can be directly added.

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AdrielDella

08/11/25 4:42am

Last time my AC wasn't cooling well, I tried adding refrigerant oil myself – quite challenging actually. You need specialized tools like a vacuum pump and adapter fittings, first turn off the engine to let the system cool. Check the manual to confirm whether it's PAG or POE oil that matches your vehicle model. Then locate the compressor oil filler port to connect the hose, slowly inject the measured oil quantity to avoid air mixing. After adding, vacuum for a few minutes to ensure sealing, then start the AC to test cooling performance. Wear gloves throughout to protect your skin – excess oil reduces efficiency, remember to clean tools to prevent contamination. DIY saves money but takes time, beginners should find assistance and watch more tutorials.

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