Removing and installing leadthrough for refrigerant lines into luggage compartment — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

• Opens: refrigerant (A/C)

Don't miss

• Seal open pipes and connections at refrigerant line with suitable caps (to prevent ingress of dirt and moisture).

📋 Procedure

1. ⚠ High voltage can cause fatal injury.Danger of severe or fatal injuries from electric shock. The high-voltage system may only be de-energised by a suitably qualified person (Audi high-voltage technician). It must be definitely confirmed that the high-voltage system is de-energised. The system may only be de-energised using the vehicle diagnostic tester via "“Guided Fault Finding”". The qualified person (Audi high-voltage technician) ensures that the system is de-energised and secured with the locking cap T40262 to prevent anyone from switching it on. Furthermore, the qualified person must also store the ignition key and maintenance connector for high-voltage system TW in a safe place as an additional measure to prevent the system from being switched back on.The qualified person (Audi high-voltage technician) marks the vehicle by attaching the appropriate warning signs. — Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
2. Remove bolts (2, 4) and detach refrigerant lines (1, 3).
3. Seal off open lines and connections with clean plugs from engine bung setVAS 6122. [Note: Seal open pipes and connections at refrigerant line with suitable caps (to prevent ingress of dirt and moisture).]
4. Remove drive battery Electrical system, hybrid93High-voltage battery unit; Removing and installing high-voltage battery.
5. Remove bolts (1) and detach drive battery mounting (2).

6. Unscrew bolt (1) and pivot the mounting plate (3) to one side.
7. Separate the refrigerant lines (2).
8. Seal off open lines and connections with clean plugs from engine bung setVAS 6122. [Note: Seal open pipes and connections at refrigerant line with suitable caps (to prevent ingress of dirt and moisture).]
9. Unscrew nuts (arrows) and detach leadthrough for refrigerant lines (1).
10. Lay bare the refrigerant lines at the mount (4).
11. Detach the leadthrough for the refrigerant lines (5). [Note: If seal in leadthrough is damaged, apply silicone adhesive sealantD 176 001 A3 or similar at this location Electronic parts catalogue.The bonding surface must be clean and free from grease when applying the silicone adhesive sealant.Observe fitting instructions for O-rings .After attaching, check routing of refrigerant lines. They must be inserted in brackets provided and should not make contact with other components.]
12. Re-install remaining components (removed earlier).
13. For electrical connections and routing, refer to .
14. Re-energise power supply of high voltage system Electrical system, hybrid93De-energising high-voltage system. [Note: Re-energising high-voltage system:Connect vehicle diagnostic testerSelect Guided Fault Finding modeUsing the Go to key, select the following menu items in successionFunction/component selectionBodyElectrical systemSelf-diagnosis compatible systems8C - Hybrid battery management -J8408C - Hybrid battery management, functions51 - Re-energise high-voltage system (Rep. gr. 93)]
15. ⚠ High voltage can cause fatal injury.Danger of severe or fatal injuries from electric shock. The high-voltage system may only be re-energised by a suitably qualified person (Audi high-voltage technician). The system may only be re-energised using the vehicle diagnostic tester via "“Guided Fault Finding”". The vehicle is then made ready for operation again by the qualified person (Audi high-voltage technician).The qualified person (Audi high-voltage technician) marks the vehicle by attaching the appropriate warning signs. — Evacuating and charging refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
16. Switch on ignition.
17. Interrogate event memory of operating and display unit (Climatronic control unit J255) and control unit for air conditioning compressor J842 and erase any faults displayed in "“Guided Fault Finding”" mode. [Note: Also observe notes on starting up air conditioner after charging Air conditioner with refrigerant R134a87General information on air conditioner.]

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