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System Overview - Refrigerant Circuit

WARNING: This page is about a different car, the 2021 Audi e-tron Quattro and 2019 Audi e-tron Quattro. However, it is still accessible from the selected car via links, so may be relevant.
GWWA87-12718Courtesy of AUDI OF AMERICA, LLC
  1. High-Voltage Battery Heat Exchanger
  2. Check Valve in the Refrigerant Line from Valve Block in Refrigerant Circuit
    • There are different versions. Refer to the Parts Information.
    • It blocks flow when temperatures are low at the condenser (or in the applicable receiver/dryer) during heat pump operation, so that refrigerant flows into these components, is stored there and is no longer available for the operation.
    • Removing and Installing. Refer to CHECK VALVE IN REFRIGERANT LINE FROM VALVE BLOCK, REMOVING AND INSTALLING .
  3. Refrigerant Shut-Off Valve 4 -N642-
  4. Refrigerant Shut-Off Valve 5 -N643-
  5. Refrigerant Shut-Off Valve 2 -N640-
  6. Refrigerant Shut-Off Valve 3 -N641-
  7. Valve Block in Refrigerant Circuit
  8. Condenser
  9. Receiver/Dryer (of the Condenser with Dryer Cartridge)
  10. A/C Pressure/Temperature Sensor -G395-
  11. Electrically-Driven A/C Compressor
  12. A/C Pressure/Temperature Sensor 2 -G826-
  13. Low Pressure Side Service Connection
    • For measuring, discharging and charging
    • Installed in the left side of the engine compartment
    • There are different versions. Refer to the Parts Information.
  14. Check Valve in the Refrigerant Line from Condenser
  15. Check Valve in the Refrigerant Line from Refrigerant Receiver
  16. Check Valve in the Refrigerant Line from Inner Heat Exchanger
  17. Refrigerant Line with Inner Heat Exchanger
    • Overview. Refer to OVERVIEW - REFRIGERANT LINES .
    • In this refrigerant line, the liquid warm refrigerant flowing in A/C operation on the high pressure side releases energy into the vaporous cold refrigerant flowing to the low pressure side. This increases the efficiency of the A/C system.
  18. Refrigerant Shut-Off Valve -V424-
    • Is activated when the A/C system is switched off and then when in heat pump and battery cooling operation, blocks the refrigerant flow to the expansion valve and thus to the evaporator in the front heater and A/C unit.
    • Removing and Installing. Refer to Refrigerant Shut-Off Valve -V424-, REMOVING AND INSTALLING .
  19. Integration in Heating Circuit (Vehicle Interior)
    • Integration in the coolant circuit. Refer to the appropriate service information .
  20. Refrigerant Receiver on Heat Exchanger for Heat Pump Operation
    • The refrigerant receiver has the same function in heat pump operation as the receiver/dryer on the condenser does when the A/C system is operating (however no dryer is installed here).
    • Removing and Installing. Refer to REFRIGERANT RECEIVER, REMOVING AND INSTALLING .
  21. Front Expansion Valve
  22. Heater Core for Heat Pump Operation with Refrigerant Receiver
  23. Evaporator
  24. High Pressure Side Service Connection
    • For measuring, discharging and charging
    • Overview. Refer to OVERVIEW - REFRIGERANT LINES .
    • There are different versions. Refer to the Parts Information.
    • Due to the layout of the service connection in the refrigerant circuit, high pressure is applied to this connection only when the refrigerant circuit is operating as a heat pump. In the A/C system operation, the same pressure is applied to the low pressure side as on the service connection.
    • To measure the refrigerant circuit pressure in the A/C system operation read of the measured value of the A/C Pressure/Temperature Sensor -G395- from the Thermal Management Control Module -J1024- use the Vehicle Diagnostic Tester.
  25. Refrigerant Expansion Valve 1 -N636-
  26. Included in the Battery Cooling Circuit
    • Integration in the coolant circuit. Refer to the appropriate service information .
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