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Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> A/C Compressor >> Air Conditioning (Refrigerant R1234YF Servicing) (2 Of 2) >> 87 Air Conditioning >> Refrigerant Circuit >> Refrigerant Circuit, Cleaning >> Connection Diagram For Cleaning (Flushing), Refrigerant Circuit With RESTRICTOR And Container (Without High-Voltage System)

Connection Diagram For Cleaning (Flushing), Refrigerant Circuit With RESTRICTOR And Container (Without High-Voltage System)

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 pipe connections to the removed reservoir are connected with each other via two adapters and Filler Hose (from VW/Audi - Passenger Vehicle Adapter Set).

Currently this assembly with restrictor and refrigerant circuit restrictor is currently not installed in Volkswagen/Audi.

The arrows in the following illustrations show the refrigerant flow direction during flushing (refrigerant flows in opposite direction of flow when A/C system is in operation while flushing, therefore the high pressure side of the A/C Service System is connected to the low pressure connection of the refrigerant circuit to the A/C compressor).

Depending on the construction of the A/C Service Station, check valves may be installed between the refrigerant circuit and the A/C Service Station (to guarantee the correct direction of refrigerant flow during flushing).

The adapter from the VW/Audi - Passenger Vehicle Adapter Set are provided with 5/8" -18 UNF threads use additional adapters from the VW/Audi - Passenger Vehicle Adapter Set so that the R1234yf -A/C Service Station filling hose can be attached.

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 four times with at least 3 kg refrigerant for each and extract the refrigerant again, evacuate).
  2. Refrigerant Hose for A/C Service Station
    • From the high pressure side of the A/C Service Station (mostly red colored) to the low pressure side connection of the A/C compressor on refrigerant circuit (larger diameter).
  3. Adapter to Connection for Low Pressure Side on Refrigerant Circuit
    • There are different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
    • Use the Refrigerant Circuits Adapter Set - Adapter 48 :VAS6338/48  between the refrigerant hose -2- and the adapter -3-.
    • From the VW/Audi - Passenger Vehicle Adapter Set.
      NOTE:

      The A/C Service Station filler hose has a M12 x 1.5-6G external thread according to SAE J639 on the adapter to the connection for the low pressure side an 5/8 -18 UNF external thread is available. So that both components can be connected an additional adapter is necessary. Refer to the Parts Information.

      To reach a maximum possible flow speed, the service coupling is removed from the filler hose to flush (there are constrictions in the service coupling, which significantly reduces the flow speed velocity).

  4. Low Pressure Side Connection on Refrigerant Circuit
  5. Connection to Reservoir
  6. Adapter for Bridging Removed Reservoir
  7. Refrigerant Filler Hose
  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 the output of the 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 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 complete 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).
  18. Refrigerant Hose for A/C Service Station
    • From the low pressure side of the A/C Service Station (mostly blue colored) to the output of the refrigerant circuit flushing device.
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