Approved Refrigerant Oils For Refrigerant R1234YF
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- Only fill the refrigerant circuit with approved refrigerant oils. The correct refrigerant oil depends on the manufacturer and the type of A/C compressor installed.
- 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.
- Refrigerant oil absorbs moisture. Do not use refrigerant oil from containers that have been open for a long period of time. Refer to REFRIGERANT AND REFRIGERANT OIL .
Important information:
Refrigerant oil attracts moisture. Close any opened containers immediately after use to prevent moisture from entering.
- The specification about the usability of the refrigerant oil is given on the bottle the refrigerant oil is delivered in.
- This time specification does not need to be observed when the delivered bottle is tightly sealed.
- Refrigerant oil from a tightly sealed bottle can also be used after the time specified on the bottle.
- The refrigerant oils specified for refrigerant R134a are not suitable for refrigerant R1234yf.
- The special refrigerant oil that is only used for refrigerant circuits with refrigerant R1234yf is not always commercially available.
- Refrigerant oils specifically designed for each compressor can therefore be obtained from the replacement parts program.
- If a faulty A/C compressor is replaced with an A/C compressor from another manufacturer, check if the same refrigerant oil is approved for the A/C compressor to be installed as the one that 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. Refer to COMPONENTS, REPLACING .
- 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).
- 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.
- 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.
- 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. Refer to Working with A/C Service Station . 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 refrigerant oil. The allocation of the service connection -1- or -2- in the vehicle is different. Refer to COMPONENT LOCATION OVERVIEW - COMPONENTS OUTSIDE OF VEHICLE INTERIOR .