Approved Refrigerant Oils For Refrigerant R1234YF
As PAG (polyalkylene glycol) oil is highly hygroscopic (attracts water), opened containers are to be immediately resealed so as to be air-tight.
PAG oil from containers which have been open for a lengthy period is no longer usable.
Malfunctions due to filling the A/C system with the wrong refrigerant oil.
- Only fill the refrigerant circuit with approved refrigerant oils. Refer to the parts information. The correct refrigerant oil depends on the manufacturer and the type of A/C compressor installed.
Malfunctions due to improper filling of the A/C system with refrigerant oil.
- Too much refrigerant oil in the refrigerant circuit increases the pressures and reduces the cooling output of the system.
- Too little refrigerant oil in the refrigerant circuit can lead to A/C compressor failure due to lubrication problems.
Danger of corrosion in the refrigerant circuit.
- Refrigerant oil absorbs moisture. Do not use refrigerant oil from containers that have been open for a long period of time. .
Important information:
Refrigerant oil attracts moisture. Close any opened containers immediately after use to prevent moisture from entering.
- The refrigerant oils specified for refrigerant R134a are not suitable for refrigerant R1234yf. Refer to the parts information.
- The special refrigerant oil that is only used for refrigerant circuits with refrigerant R1234yf is not always commercially available. Refer to the parts information.
- Refrigerant oils specifically designed for each compressor can therefore be obtained from the replacement parts program. Refer to the parts information.
- If a faulty A/C compressor is replaced with an A/C compressor from another manufacturer check for the A/C compressor to be installed has the same refrigerant oil approved which is already in the refrigerant circuit (from the removed A/C compressor). The refrigerant circuit must be cleaned (flushed) if the A/C compressor to be installed requires a different refrigerant oil than the refrigerant oil used for the removed A/C compressor. .
- The use of other refrigerant oils could cause system failure, as they do not always mix and thus circulate with refrigerant R1234yf (for compressor lubrication).
- There are different refrigerant oils used for the "Denso" -, "Delphi/Mahle" -, "Visteon" and "Sanden" A/C compressors. Refer to the parts information.
- The refrigerant oil (part number G 055 535 M2, external label ND 12)) to be used on refrigerant circuits with a "Denso" A/C compressor is the same for mechanically and electrically-driven A/C compressors. Refer to the parts information.
- The refrigerant oil (part number G 052 535 M2, external label SP A2) is to be used for mechanically and electrically-driven "Sanden", "Delphi/Mahle" or "Visteon" A/C compressors. Refer to the parts information.
Since different refrigerant oils are used depending on the A/C compressor manufacturer, a certain small amount (up to maximum 10%) of refrigerant oil may be released in the respective vehicle refrigerant circuit with a different specification as the respective A/C compressor installed. This is so that the A/C service station does not have to be cleaned after every procedure on different vehicles. Therefore for Audi, up to a maximum of 10% SP A2 refrigerant oil may be filled on a vehicle with a "Denso" A/C compressor (with ND 12 refrigerant oil), or up to a maximum of 10% ND 12 refrigerant oil may be filled on a vehicle with a "Sanden", "Delphi/Mahle" or "Visteon" A/C compressor (with SP A2 refrigerant oil). However, other refrigerant oils that are not specified here may not be filled (different properties due to different viscosity, other or missing additives, etc.).
Instead of discharging via the A/C service station, the extracted refrigerant oil can either be filled when discharging the refrigerant circuit via an open connection before evacuating the refrigerant circuit, or at the removed valve -3- via a service connection -1- or -2- using a commercially available syringe. . This is useful for example when a refrigerant oil is specified for a refrigerant circuit, that is normally only seldom used. Always fill with fresh coolant oil. Refer to the parts information. The allocation of the service connection -1- or -2- in the vehicle is different. Refer to SYSTEM OVERVIEW - REFRIGERANT CIRCUIT