What is the method for adding refrigerant oil to a car's air conditioning system?
2 Answers
Generally, there are two methods for adding refrigerant oil to the air conditioning system: the direct filling method and the vacuum suction method. The details are as follows: 1. Direct filling method: The direct filling method simply involves pouring the refrigerant oil directly into the compressor through the plug opening, which is very convenient. 2. Vacuum suction method: (1) Evacuation: Use a specialized vacuum tool to remove the air from inside the air conditioning system. (2) Negative pressure suction: After the air inside the air conditioning system is removed, use negative pressure to draw the refrigerant oil into the compressor through a yellow hose. (3) Adding refrigerant: Once the refrigerant oil is completely drawn into the compressor, the addition of refrigerant oil is complete, and then the refrigerant can be added directly.
To add refrigerant oil to a car's air conditioning system, especially refrigerant and compressor oil, I think it should be done step by step. First, prepare the necessary tools, such as a manifold gauge set, vacuum pump, and charging hoses. Check the A/C system for leaks by applying soapy water to the connections and looking for bubbles. If there's a leak, it must be repaired first. Next, recover the remaining old refrigerant to prevent environmental pollution. Evacuating the system is a crucial step—use a vacuum pump for 15-20 minutes to ensure the system is dry and free of air, as any moisture or air can affect cooling performance. Then, add the compressor oil, typically using a syringe to inject it through the low-pressure port. The amount of oil needed depends on the vehicle's manual—avoid overfilling to prevent clogs. Finally, add the refrigerant, such as R134a, slowly until it reaches the specified pressure range, then run the A/C to check cooling performance. The whole process is quite technical, and without experience, mistakes are easy to make, so I always recommend going to a professional shop—they have the right equipment, and it’s hassle-free. Regular A/C maintenance can extend its lifespan and prevent refrigerant leaks that lead to loss of cooling.
