LEMON Manuals: Even more car manuals for everyone
Home >> Audi >> 2016 >> S5 Prestige, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 69 (AIR CONDITIONING R134a (REFRIGERANT CIRCUIT) (COUPE)) >> 87 Air Conditioning >> Refrigerant Circuit >> Refrigerant Circuit, Cleaning (Flushing) With Refrigerant R134A >> Flushing Circuit Block Diagrams

Flushing Circuit Block Diagrams

WARNING: This page is about a different variant/trim than selected.
NOTE:

The arrows in the following illustrations show the refrigerant flow direction during flushing (refrigerant flows in the 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).

These block diagrams indicate a refrigerant circuit with restrictor and reservoir, and a refrigerant circuit with expansion valve, receiver/dryer and a second evaporator (optional equipment on certain vehicles).

Depending on the design 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).

Flushing Circuit On Vehicles With High-Voltage System

Refrigerant Circuit with Restrictor and Reservoir. Refer to FLUSHING CIRCUIT BLOCK DIAGRAMS .

Refrigerant Circuit with Expansion Valve, Receiver/Dryer and Second Evaporator. Refer to FLUSHING CIRCUIT BLOCK DIAGRAMS .

Vehicles with High-Voltage System (without Additional A/C System Functions, for Example the Audi A3 e-tron, Audi Q5 hybrid etc.). Refer to FLUSHING CIRCUIT BLOCK DIAGRAMS .

Vehicles with High-Voltage System (with Additional A/C System Functions, such as Heat Pump Operation on Audi Q7 e-tron, for Example). Refer to FLUSHING CIRCUIT BLOCK DIAGRAMS .

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  ).

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.

Refrigerant Circuit with Expansion Valve, Receiver/Dryer and Second Evaporator

NOTE:

This main wiring diagram shows a refrigerant circuit with expansion valve, receiver/dryer and second evaporator (optional equipment on certain vehicles).

On vehicles with an expansion valve and receiver/dryer, the expansion valve is removed and replaced by an adapter. Depending on the vehicle, the receiver/dryer must also be removed and line connections to fluid reservoir be connected to each other by two adapters and a charge hose.

On a vehicle with only one evaporator, components from item "16" are not present or are not needed.

GWWA87-10131Courtesy of AUDI OF AMERICA, LLC
  1. A/C Service Station
    • With electronics and a flushing program, A/C Service Station With Flushing Device. Refer to 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. Adapter for Removed Expansion Valve
  6. Evaporator
  7. Connection to Receiver/Dryer
  8. Adapter for Bridging Removed Receiver/Dryer
  9. Refrigerant Charging Hose. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
    • For example, Hose:VAS6338/31  (from the Refrigerant Circuits Adapter Set 1:VAS6338/1  )
  10. Condenser
  11. High Pressure Side Connection on Refrigerant Circuit
  12. Adapter to Connection for High Pressure Side on Refrigerant Circuit
  13. 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.
  14. 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).
  15. 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.
  16. Adapter for Sealing Outlet to Second Evaporator
    • Only necessary on certain vehicles with optional equipment "second evaporator"
    • From the Refrigerant Circuits Adapter Set 1:VAS6338/1 
  17. Adapter for Sealing Outlet to Second Evaporator
    • Only necessary on certain vehicles with optional equipment "second evaporator"
    • From the Refrigerant Circuits Adapter Set 1:VAS6338/1 
  18. Low Pressure Side Connection on Refrigerant Circuit to Second Evaporator
  19. High Pressure Side Connection on Refrigerant Circuit to Second Evaporator
  20. Adapter for Removed Expansion Valve on Second Evaporator
    • There are different versions depending on the vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
    • Only necessary on certain vehicles with optional equipment "second evaporator"
    • From the Refrigerant Circuits Adapter Set 1:VAS6338/1 
  21. Second Evaporator
    • Only present on certain vehicles with optional equipment "second evaporator"

Vehicles with High-Voltage System (without Additional A/C System Functions, for Example the Audi A3 e-tron, Audi Q5 hybrid etc.)

NOTE:

The refrigerant circuit is cleaned in two flushing cycles (first the section with the evaporator in the front heater and A/C unit and then the section with the high-voltage battery heat exchanger or the evaporator in the battery cooling module). Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .

For Vehicles With Two Evaporators Or An Evaporator With A Heat Exchanger, Disconnect The Circuit To The Second Evaporator Or To The Heat Exchanger From The Circuit For The First Evaporator Using The Manual Shut-Off Valves And Flush It In A Separate Work Procedure. Refer To ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT and REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (vehicle-specific repair information).

The Design Of The Different Flushing Circuits For This Vehicle Is Similar To A Vehicle With Two Evaporators. Refer To FLUSHING CIRCUIT BLOCK DIAGRAMS .

Vehicles with High-Voltage System (with Additional A/C System Functions, such as Heat Pump Operation on Audi Q7 e-tron, for Example)

NOTE:

The refrigerant circuit is cleaned in multiple flushing cycles. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT and REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (Cleaning the A/C system refrigerant circuit).

To Flush, The Circuit Is Divided Into Multiple Sections And Then Cleaned During One Flushing Cycle At A Time. It Is Divided By Activating The Installed Electrically Activated Valves And Using The Installed Manual Shut-Off Valves. Refer To REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (Cleaning the A/C system refrigerant circuit).

The Design Of The Different Flushing Circuits For These Vehicles Is Described In The Respective Vehicle-Specific Repair Information. Refer To REFRIGERANT CIRCUIT - 1 , REFRIGERANT CIRCUIT - 2 , REFRIGERANT CIRCUIT 1234yf - 1 , REFRIGERANT CIRCUIT 1234yf - 2 , REFRIGERANT CIRCUIT GENERAL INFORMATION R134a , REFRIGERANT CIRCUIT R134a (Cleaning the A/C system refrigerant circuit).

scientia non olet · About LEMON Manuals