OVERVIEW - EXPANSION VALVE AND REFRIGERANT LINES TO THE REAR HEATER AND A/C UNIT, VEHICLES WITH "High A/C System"

Fig 1: Exploded View Of Expansion Valve And Refrigerant Lines To The Rear Heater And A/C Unit, Vehicles With "High A/C System"

Courtesy of AUDI OF AMERICA, LLC

1. Pass-Through for the Refrigerant Lines in the Vehicle Interior
   • to evaporator in rear heater and a/c unit
   • Removing and Installing. Refer to HEATER AND A/C UNIT, REMOVING AND INSTALLING, "High" A/C SYSTEM, PR NUMBER 9AH/ 9AQ .
2. Nut
   • 9 Nm
   • To the threaded pin on the refrigerant line bracket on the evaporator in the rear heater and A/C unit
3. O-Ring
   • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
   • Lubricate lightly with refrigerant oil before installing
4. O-Ring
   • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
   • Lubricate lightly with refrigerant oil before installing
5. Refrigerant Line - Low Pressure Side
   • On the underbody in the area of the center tunnel
   • from the refrigerant line opening in the vehicle interior to the expansion valve
   • Removing and installing on the rear expansion valve. Refer to REFRIGERANT LINES, REMOVING AND INSTALLING, FROM CONNECTION POINT TO REAR EXPANSION VALVE .
   • Removing and Installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING .
6. Refrigerant Line - Low Pressure Side
   • On the underbody in the area of the center tunnel
   • From the expansion valve to the refrigerant line opening in the vehicle interior
   • Removing and installing on the rear expansion valve. Refer to REFRIGERANT LINES, REMOVING AND INSTALLING, FROM CONNECTION POINT TO REAR EXPANSION VALVE .
   • Removing and Installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING .
7. Retaining Plate
8. O-Ring
   • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
   • Lubricate lightly with refrigerant oil before installing
9. O-Ring
   • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
   • Lubricate lightly with refrigerant oil before installing
10. Screw
    • 9 Nm
    • Quantity: 2
    • Removing and Installing. Refer to REAR EXPANSION VALVE, REMOVING AND INSTALLING .
11. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
12. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
13. Nut
    • 9 Nm
    • Removing and Installing. Refer to REAR EXPANSION VALVE, REMOVING AND INSTALLING .
14. Rear Expansion Valve
    • There are different versions. Refer to the Parts Information.
    • Refrigerant Line, Disconnecting and Connecting. Refer to REFRIGERANT LINES, REMOVING AND INSTALLING, FROM REAR EXPANSION VALVE TO EVAPORATOR IN REAR HEATER AND A/C UNIT .
    • Removing and Installing. Refer to REAR EXPANSION VALVE, REMOVING AND INSTALLING .
    • There are different versions depending on the refrigerant (R134a or R1234yf). Refer to the Parts Information.
15. Bracket
    • For the refrigerant lines on the underbody
16. Refrigerant Line - Low Pressure Side
    • On the underbody
    • From the expansion valve
    • Removing and installing on the rear expansion valve. Refer to REFRIGERANT LINES, REMOVING AND INSTALLING, FROM CONNECTION POINT TO REAR EXPANSION VALVE .
    • Removing and Installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING .
17. Nut
    • 2 Nm
18. Refrigerant Line - High Pressure Side
    • On the underbody
    • To the expansion valve
    • Removing and installing on the rear expansion valve. Refer to REFRIGERANT LINES, REMOVING AND INSTALLING, FROM CONNECTION POINT TO REAR EXPANSION VALVE .
    • Removing and Installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING .
19. Nut
    • 4 Nm
    • Quantity: 2
20. Bracket
    • For the refrigerant lines on the underbody
21. Screw
    • 9 Nm
22. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
23. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
24. Bracket
    • For the refrigerant lines on the underbody
25. Nut
    • 4.5 Nm
    • Quantity: 2
26. Screw
    • 9 Nm
27. Refrigerant Line - Low Pressure Side
    • On the underbody and under the left fender
    • To the opening in the plenum chamber
    • Removing and installing from the pass-through in the plenum chamber. Refer to PLENUM CHAMBER REFRIGERANT LINE PASS-THROUGH, REMOVING AND INSTALLING .
    • Removing and Installing. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING .
28. Screw
    • 9 Nm
29. Refrigerant Line - High Pressure Side
    • On the underbody and under the left fender
    • From the opening in the plenum chamber
    • Removing and installing from the pass-through in the plenum chamber. Refer to PLENUM CHAMBER REFRIGERANT LINE PASS-THROUGH, REMOVING AND INSTALLING .
    • Removing and Installing. Refer to PLENUM CHAMBER REFRIGERANT LINE PASS-THROUGH, REMOVING AND INSTALLING .
30. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
31. O-Ring
    • Replace after removing; version. Refer to REFRIGERANT CIRCUIT SEALS and the Parts Information.
    • Lubricate lightly with refrigerant oil before installing
32. Pass-Through for Refrigerant Lines in the Plenum Chamber
    • There are different versions. Refer to the Parts Information.
    • This illustration shows the version for vehicles with a second evaporator (with a "High" A/C system)
    • Removing and Installing. Refer to PLENUM CHAMBER REFRIGERANT LINE PASS-THROUGH, REMOVING AND INSTALLING .