Flush the Electrically Driven A/C Compressor

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 Audi S7, 2015 Audi RS 7, 2015 Audi A7 Quattro, 2014 Audi S7, and 2014 Audi RS 7. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying A/C Service Station

Courtesy of AUDI OF AMERICA, LLC

A/C Service Station
- With electronics and a flushing program, A/C Service Station With Flushing Device.
- If an A/C service station without a flushing program is used, the procedure must be performed manually (evacuate, flush three times with at least 2 kg refrigerant each and extract refrigerant again, evacuate).
A/C Service Station Refrigerant Hose
- From high pressure side of A/C service station (mostly colored red) to low pressure side connection of A/C compressor on refrigerant circuit (larger diameter).
Adapter to the Connection for the Low Pressure Side on the A/C Compressor
- There are different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- Use the adapter from the Refrigerant Circuits Adapter Set 1 VAS6338/1 (here the Refrigerant Circuits Adapter Set 2 - Adapter 41 VAS6338/41).
Refrigerant Line
- To the A/C compressor connection on the adapter. Refer to item -3- in 3
  NOTE:
  Only use the refrigerant line when the Refrigerant Circuits Adapter Set 2 - Adapter 41 VAS6338/41 is not available.
  
  If the Refrigerant Circuits Adapter Set 2 - Adapter 41 VAS6338/41 is not available to remove the flushing circuit, for example remove the refrigerant lines to the condenser, from the vehicle (or use a refrigerant line with the part number 7L6 820 744 AD). .
Electrically-Driven A/C Compressor
- The A/C compressor is flushed in the flow direction (from the low pressure side input to the high pressure side output)
- So that as much refrigerant oil as possible is flushed out from the A/C compressor, the A/C compressor must be positioned so that the high pressure side output is as low as possible
Refrigerant Line
- To the A/C compressor connection on the adapter. Refer to item -7- in 7
  NOTE:
  Only use the refrigerant line when the Refrigerant Circuits Adapter Set 2 - Adapter 40 VAS6338/40 is not available.
  
  If the Refrigerant Circuits Adapter Set 2 - Adapter 40 VAS6338/40 is not available to remove the flushing circuit use for example on a refrigerant line with the part number 7L6 820 721 BF or 4G0 260 701 AB.
Adapter to the Connection for the High Pressure Side on the Refrigerant Circuit
- There are different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- Use the adapter from the Refrigerant Circuits Adapter Set 1 VAS6338/1 (here the Refrigerant Circuits Adapter Set 2 - Adapter 40 VAS6338/40).
Charge Hose for Refrigerant Circuit Flushing Device
- From connection to the high pressure side of the A/C compressor on the refrigerant circuit (smaller diameter) to input of refrigerant circuit flushing device.
Flushing Equipment for Refrigerant Circuits
- There are different versions of the Refrigerant Circuit Flushing Device.
- With filter, viewing glass, safety valve, heating, refrigerant container etc. (depending on version).
- Depending on the construction of the A/C service station and of refrigerant circuit flushing device, a check-valve may be installed at output of refrigerant circuit flushing device (to guarantee correct direction of refrigerant flow during flushing).
A/C Service Station Refrigerant Hose
- From the low pressure side of the service station (mostly blue) to the output of the flushing device for refrigerant circuits.