How to Add Refrigeration Oil to the Compressor?

[DiFelicity]

The methods for adding refrigeration oil to the compressor are as follows: 1. Use the compressor's own vacuum suction to draw in the oil. 2. Use air pressure to force the lubricating oil in, suitable for small fully enclosed compressors where the intake and exhaust ports are not equipped with intake and exhaust shut-off valves. 3. Use a gear hydraulic pump or a manual hydraulic pump to directly add oil through the three-way valve or drain valve on the crankcase. 4. Utilize the compressor oil pump to add oil through the three-way valve on the oil pipe. The methods for draining refrigeration oil are as follows: 1. Remove the compressor from the unit, leaving the openings of the exhaust pipe, return pipe, and process pipe open. 2. Invert the compressor to allow the refrigeration oil to flow out from the return pipe and process pipe, and measure the amount of oil that flows out using a scale or measuring cup to provide a reference for adding refrigeration oil. 3. To speed up the flow of refrigeration oil, nitrogen can be introduced through the process pipe or return pipe.

[ChristianLee]

I've changed compressor refrigeration oil myself before, and it's quite a meticulous process. First, you need to locate the compressor oil filler port, usually a small bolt cap. The AC system must be vacuumed before opening it, otherwise letting air in would ruin everything. I used a dedicated oil filling tube to slowly squeeze it in, while constantly monitoring the dipstick scale. Overfilling can cause oil spraying, while underfilling leads to insufficient lubrication. The most frustrating part is that different car brands require different oil specifications—I spent half a day checking the manual last time to confirm using PVE oil. The whole process requires wearing gloves, as this oil is particularly hard to wash off your hands. After finishing, you still need to check pipeline sealing and run the AC for a few minutes. Honestly, without experience, it's better not to mess with it—just spend some money at the 4S shop for peace of mind.

[DeKingston]

When my car's AC had issues, the technician told me this is how refrigerant oil should be added. Prepare a small syringe and tubing, locate the compressor's low-pressure port. Most importantly, the system must be vacuumed first, otherwise moisture contamination will ruin it. Operate by slowly pushing the syringe to let the oil flow naturally. They use professional equipment to measure the oil quantity, stopping when reaching the manufacturer's specified amount. After adding, waste refrigerant oil must be properly disposed as it's environmentally hazardous. The whole process requires safety goggles - getting refrigerant oil in eyes is extremely dangerous. Thinking back, such precision work is better left to professional auto repair shops.

[MacFaith]

Last time I helped a friend add refrigeration oil, the steps were actually quite simple. First, locate the oil filling port with the O-ring on the compressor and unscrew it with an Allen wrench. Connect a funnel hose and slowly pour in the refrigeration oil. There are two key points: the air conditioning lines must be purged first, and avoid letting air in during the oil pouring process. Control the amount according to the service manual; for most cars, adding 60-100ml is sufficient. After the operation, apply special sealing grease to the connections. The whole process takes less than half an hour, but those who are unsure should not attempt it.

[VanValeria]

Adding refrigerant oil requires meticulous care. First, disconnect the vehicle's power supply to prevent accidents. After locating the compressor's oil filling port, clean the surrounding dust. When pouring the oil, use a dedicated measuring container with graduations—I've seen people use plastic water bottles and end up overfilling. The choice of oil is also crucial; my car uses Pag oil, while my neighbor's Japanese car requires ND oil. After the operation, remember to replace the dryer bottle. Finally, start the air conditioning for a test run. If you notice abnormal noises or cooling issues, it indicates a failed refill. Beginners are advised to watch instructional videos before attempting the procedure.

[VonBryce]

My experience is that adding refrigerant oil requires considering the compressor type. For scroll compressors, you need to remove the housing to inject oil, while swash plate compressors have a dedicated oil filling port. Always test the refrigerant oil condition before operation—if it's black or contains impurities, replace it with new oil. Maintaining a 30-degree tilt angle when pouring oil is ideal. Last year, I made a mistake that caused refrigerant oil to splash, and it took me two hours to clean the dashboard. Now I know to lay down protective mats and prepare absorbent cotton. This job is better done in a garage since outdoor wind can blow in dust.