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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> Air Conditioning (Refrigerant R134A Servicing) (2 Of 2) >> 87 Air Conditioning >> Refrigerant Circuit >> Refrigerant Circuit, Cleaning (Flushing) With Refrigerant R134A >> Sequence of flushing procedure (sequence occurs automatically according to the A/C service station program) >> Refrigerant Circuit with Restrictor and Reservoir

Refrigerant Circuit with Restrictor and Reservoir

NOTE:

For vehicles with a restrictor and reservoir, the restrictor and reservoir are removed and the lines that were disconnected to remove the restrictor are reassembled. The line connections to the removed reservoir are connected with each other via two adapters and the Hose :VAS6338/31  (from the Refrigerant Circuits Adapter Set 1 :VAS6338/1  ).

Fig 1: Block Diagram For Flushing Circuits (Type 1)
GWWA87-10135Courtesy of AUDI OF AMERICA, LLC
  1. A/C Service Station
    • With electronics and a flushing program, for example A/C Service Station with Flushing Device. Refer to the Parts Information (Tools; Special Tools and Equipment: A/C and Heating).
    • 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 4 kg refrigerant each and extract refrigerant again, evacuate).
  2. A/C Service Station Refrigerant Hose
    • From the high pressure side of the A/C service station (mostly colored red) to the connection for the low pressure side of the A/C compressor on the refrigerant circuit (larger diameter).
  3. Adapter to Connection for Low Pressure Side on Refrigerant Circuit
  4. Low Pressure Side Connection on Refrigerant Circuit
  5. Connection to Reservoir
  6. Adapter for Bridging Removed Reservoir
  7. Refrigerant Charging Hose. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
    • For example, Hose :VAS6338/31  (from the Refrigerant Circuits Adapter Set 1 :VAS6338/1  )
  8. Adapter for Bridging Removed Reservoir
  9. Connection to Reservoir
  10. Evaporator
  11. Restrictor Component Location
  12. Refrigerant Line Threaded Connection
  13. Condenser
  14. High Pressure Side Connection on Refrigerant Circuit
  15. Adapter to Connection for High Pressure Side on Refrigerant Circuit
  16. Charging Hose for Refrigerant Circuit Flushing Device
    • From the connection to the high pressure side of the A/C compressor on the refrigerant circuit (smaller diameter) to the input of the refrigerant circuit flushing device.
  17. Refrigerant Circuit Flushing Device
    • There are different versions of the Refrigerant Circuit Flushing Device. Refer to the Parts Information (Tools; Special Tools and Equipment: A/C and Heating).
    • With filter, viewing glass, safety valve, heater, refrigerant reservoir, 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).
    • Depending on the design of the refrigerant circuit flushing device, a connection for a refrigerant circuit service coupling may be located at the outlet (and possibly also at the inlet) of the flushing device (instead of a 5/8-18 UNF external thread). If a service connection with a valve is installed on the outlet of the flushing device, this valve must be all the way open when the service coupling is attached (a partially opened valve creates a constriction). If there is a connection for a service coupling on the inlet of the flushing device, the inlet must be modified so that the refrigerant hose coming from the vehicle can be directly connected (a service coupling and a valve in the flushing device inlet create a constriction that impedes the flow of refrigerant from the vehicle to the flushing device and thus the flushing procedure).
      CAUTION:

      Risk of icing over the output of the flushing device via the installed valve which is not correctly opened.

      • A partially opened valve installed in this connection creates a constriction that impairs the flow of refrigerant in the flushing device and can ice over due to severe cooling.
      • If there is a service connection with a valve on the outlet of the flushing device, this valve must be all the way open during the flushing procedure.
      • If there is too strong of cooling (icing over) at the outlet of the flushing device during the flushing procedure, stop the flushing procedure and evacuate the refrigerant from the flushing device and the vehicle via the high and low pressure side. Check the valve in the outlet of the flushing device and service it if necessary.

      Risk of icing on the input of the flushing device due to a constriction which is created via a service coupling and in a service connection installed valve.

      • Remove the service connection installed on this connection, and connect the service hose that comes from the vehicle directly (without constriction) to the flushing device, possibly using a necessary adapter (depending on the inlet thread of the flushing device).
  18. A/C Service Station Refrigerant Hose
    • From the A/C service station low pressure side (mostly blue) to the outlet of the refrigerant circuit flushing device.
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