Should an oil be added to A/C system after full freon recovery?
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AudiWorld Junior Member
Joined: May 2018
Posts: 21
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Should an oil be added to A/C system after full freon recovery?
Hello,
I have a 2002 Audi A6 3.0L Quattro. About two weeks ago I replaced a leaking radiator. To do this I had to remove the AC condenser. Before it, I went to the mechanic to have the refrigerant fully removed from the system. While I was watching the freon recovery process, I saw at the end that the machine was draining oil too.
I have a question. Would the oil be removed completely from the system by the recovery machine? I want to recharge the AC system myself, and I am confused if I should add 8.5 oz of PAG46 oil before adding r134a refrigerant (without oil added)? When I removed the condenser there was oil still coming out from the hose. After installing the condenser back and connecting a vacuum pump to Hi and Low lines, I saw oil through the small window in the gauges. The oil was coming out of the Hi pressure line.
If the oil is needed, can I use the PAG46 in the pressurized can (3z cans) and injected to a low pressure line, like the freon would be added?
Thanks.
I have a 2002 Audi A6 3.0L Quattro. About two weeks ago I replaced a leaking radiator. To do this I had to remove the AC condenser. Before it, I went to the mechanic to have the refrigerant fully removed from the system. While I was watching the freon recovery process, I saw at the end that the machine was draining oil too.
I have a question. Would the oil be removed completely from the system by the recovery machine? I want to recharge the AC system myself, and I am confused if I should add 8.5 oz of PAG46 oil before adding r134a refrigerant (without oil added)? When I removed the condenser there was oil still coming out from the hose. After installing the condenser back and connecting a vacuum pump to Hi and Low lines, I saw oil through the small window in the gauges. The oil was coming out of the Hi pressure line.
If the oil is needed, can I use the PAG46 in the pressurized can (3z cans) and injected to a low pressure line, like the freon would be added?
Thanks.
AudiWorld Senior Member
Joined: Mar 2004
Posts: 911
Likes: 17
The vacuum machine does extract the oil. I just looked at the Bentley manual and the PAG oil is specific to the compressor manufacturer(Denso G 052 300 A2, Sanden G 052 154 A2, Zexel G 052 154 A2 or G 052 200 A2). For the 3.0 engine the quantity listed is 7.4 oz + 1.7 oz. Why the quantity is split is not explained. Could be the extra amount if new compressor is installed. I personally would have an A/C pro do it. The system can be flushed to insure a fresh refill.
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