How to Add Refrigerant Oil to an Automotive Compressor?

[Douglas]

Methods for adding refrigerant oil to an automotive compressor: 1. After completing the vacuum operation, remove the intermediate injection hose from the vacuum pump and connect it to the refrigerant injection valve interface. Install the refrigerant canister and open it using the injection valve; 2. Loosen the intermediate hose connector connected to the manifold pressure gauge slightly to release the air in the intermediate injection hose; 3. Open the high-pressure side manual valve of the manifold pressure gauge, allowing the refrigerant to enter the system's high-pressure side through the high-pressure injection hose. In the compressor, the refrigerant oil primarily serves four functions: lubrication, sealing, cooling, and energy regulation. Precautions for using refrigerant oil in automotive compressors: 1. Use the specified brand and do not substitute; 2. Measure and add the exact quantity, and ensure proper disposal of waste oil.

[DiRichard]

I'm always passionate about studying cars, and adding refrigerant oil to the car's air conditioning compressor isn't exactly a simple task. First, you need to ensure the AC system has been evacuated of refrigerant, otherwise, the operation can't proceed. Then locate the compressor's oil filler port, which usually has a dedicated filling hole or dipstick position. Prepare the appropriate brand and type of refrigerant oil for your vehicle—don't just add any oil, as different compressors require different oil types. I typically use a dedicated oil filling tool connected to the system, adding the oil slowly while strictly controlling the amount with a measuring tool to stay within 50 milliliters. Adding too much can reduce cooling efficiency, while too little affects lubrication. After adding, don't forget to re-evacuate the system and recharge it with refrigerant—that's the complete process. But honestly, doing it yourself carries significant risks; if you lack experience, it's much more convenient to leave it to a professional repair shop.