Removing and installing refrigerant lines to front expansion valve — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

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

Don't miss

• The front wall of the plenum chamber (A) is attached using plastic nuts (B), expanding rivets (C) and bolts (D).
• On vehicles with a high-voltage system (hybrid vehicles with battery cooling module), the refrigerant line (C) is fitted with the shut-off valve 1 for refrigerant of hybrid battery N516.
• 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 plenum chamber cover (A)General body repairs, exterior50Bulkhead; Removing and installing plenum chamber cover.
4. Remove front left wheel housing liner General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
5. Remove plenum chamber partition panel (A)General body repairs, exterior50Bulkhead; Exploded view - bulkhead. [Note: The front wall of the plenum chamber (A) is attached using plastic nuts (B), expanding rivets (C) and bolts (D).]

6. Unfasten the socket (F) from the left side wall of the plenum chamber (H).
7. On vehicles with a rear air conditioning unit/battery cooling module, detach the refrigerant lines leading to the evaporator in the rear air conditioning unit/battery cooling module from refrigerant lines (B) and (C)Unfastening and assembling connection points in refrigerant lines. [Note: On vehicles with a high-voltage system (hybrid vehicles with battery cooling module), the refrigerant line (C) is fitted with the shut-off valve 1 for refrigerant of hybrid battery N516.]
8. Detach the refrigerant lines (B) and (C) from the quick-release couplings at the refrigerant line with internal heat exchanger (K)Detaching and attaching refrigerant lines at quick-release couplings.
9. Detach the refrigerant lines (B) and (C) from the front expansion valve (J)Detaching refrigerant lines from front expansion valve/re-attaching.
10. Check the fitted pins (G) (installed in the connection of the refrigerant line or in the expansion valve (J), not provided at all connections) for damage and proper attachment.
11. Clean the refrigerant line connections at the expansion valve (J) and at the refrigerant lines (B) and (C) and check for damage.
12. Renew O-rings (D) and (E); for correct version, refer to Electronic parts catalogue.
13. Lubricate O-rings lightly with refrigerant oil before installing Refrigerant circuit seals.
14. Attach the refrigerant lines (B) and (C) to the quick-release couplings at the refrigerant line with internal heat exchanger (K)Detaching and attaching refrigerant lines at quick-release couplings.
15. On vehicles with a rear air conditioning unit/battery cooling module, attach the refrigerant lines leading to the evaporator in the rear air conditioning unit/battery cooling module to the refrigerant lines (B) and (C)Unfastening and assembling connection points in refrigerant lines.
16. 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.
17. Evacuating and charging refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
18. Re-install remaining components (removed earlier).
19. 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.
20. 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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