How much refrigerant oil needs to be replenished when replacing the condenser?
2 Answers
Generally around forty milliliters. Below are relevant explanations: 1. The role of the condenser: The condenser is typically located at the very front of the car, aiming to cool the refrigerant in the pipelines using the incoming wind while the car is moving. 2. The principle of the condenser: The high-temperature, high-pressure liquid refrigerant from the compressor turns into medium-temperature, medium-pressure refrigerant after passing through the condenser, and is then fed into the next stage's liquid storage tank or dryer. The process through the condenser is a highly effective cooling stage. If the condenser fails, it may lead to pipeline pressure imbalance and cause air conditioning malfunctions.
When repairing air conditioning systems, I've seen many cases where replacing the condenser inevitably leads to some loss of refrigerant oil, requiring replenishment to lubricate the compressor and prevent wear. It's generally recommended to add 15% to 20% of the system's total oil capacity, with the exact amount depending on the vehicle model and original oil level. For example, common passenger cars typically have a total system oil capacity between 100 to 200 milliliters, so you'd add approximately 20 to 40 milliliters. During the operation, it's best to measure the amount of old oil lost and then precisely add back the same amount of new oil. The key is not to mix different oil types—always use compatible PAG or ESTER oil, otherwise the system may develop leaks or get damaged. From experience, DIYers should ideally use an electronic scale for measurement, as overfilling can clog the pipes while underfilling may cause compressor failure. Safety first—always check the manual for specifications before proceeding.