Removing and installing refrigerant lines from connection point to rear expansion valve — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

• Opens: refrigerant (A/C)
• Also covered elsewhere: Electronic parts catalogue

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• Lubricate O-rings lightly with refrigerant oil before installing Refrigerant circuit seals.
• Following attachment, check the routing of the refrigerant lines. Ensure strain-free insertion in the holders provided and make sure the lines do not come into contact with other components.

📋 Procedure

1. Switch off ignition.
2. Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
3. Remove front left wheel housing liner General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
4. Remove left aerodynamic fairing of underbody General body repairs, exterior66Underbody trim panels; Removing and installing underbody trim panels.
5. Detach the refrigerant lines to the rear expansion valve (A) and (B) (to the evaporator in the rear air conditioning unit) from the refrigerant lines to the expansion valve in the front air conditioning unit (G) and (H)Unfastening and assembling connection points in refrigerant lines.

6. Detach the holder (F).
7. Unfasten the holder (D) from the vehicle.
8. Unfasten the holder (C) from the vehicle.
9. Detach the refrigerant lines from the rear expansion valve (E)Detaching and attaching refrigerant lines at expansion valve (rear).
10. Clean the refrigerant line connections at the connection for the refrigerant pipes (A) to the evaporator in the rear air conditioning unit and at the refrigerant lines (D) and (E) and check for damage.
11. Replace the O-rings (B) and (C) at the connections of the refrigerant lines (D) and (E); for version, refer to Electronic parts catalogue.
12. Lubricate O-rings lightly with refrigerant oil before installing Refrigerant circuit seals.
13. Pay attention to correct positioning of the O-rings on the connections of the refrigerant lines (D) and (E).
14. Following attachment, check the routing of the refrigerant lines. Ensure strain-free insertion in the holders provided and make sure the lines do not come into contact with other components.
15. Evacuating and charging refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
16. Re-install remaining components (removed earlier).
17. Interrogate the event recorder of the front air conditioner operating and display unit, Climatronic control unit J255 and erase any faults displayed in "“Guided Fault Finding”" mode.
18. Start up air conditioner after charging refrigerant circuit Starting up air conditioner after charging refrigerant circuit. [Note: Also observe notes on starting up air conditioner after charging Air conditioner with refrigerant R134a87General information on air conditioner.]

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