Removing and installing expansion valve with refrigerant shut-off valve 2 for hybrid battery N517 — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

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

Don't miss

• Seal open pipes and connections at refrigerant line with suitable caps (to prevent ingress of dirt and moisture).
• Lubricate O-rings lightly with refrigerant oil before installing .

📋 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. — Switch off ignition.
2. Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
3. Remove luggage compartment floor General body repairs, interior70Luggage compartment trim panels; Exploded view - luggage compartment floor.
4. Remove drive battery Electrical system, hybrid93High-voltage battery unit; Removing and installing high-voltage battery.
5. Remove air outlet duct (rear) for drive battery .

6. Remove air inlet duct for drive battery .
7. Remove air outlet duct (front) for drive battery .
8. Remove bolts (2, 3) and detach refrigerant lines (1, 4).
9. Take electrical connector (2) out of bracket and unplug.
10. Remove bolts (1).
11. Remove refrigerant shut-off valve 2 for hybrid battery N517(item 3) from refrigerant lines to evaporator. [Note: Seal open pipes and connections at refrigerant line with suitable caps (to prevent ingress of dirt and moisture).]
12. Clean connecting pipes (C) and (E) to evaporator as well as connections at expansion valve and check for damage. [Note: There are different versions of the expansion valve (identical housing but different characteristic control curve); therefore it is important to observe the correct assignment Electronic parts catalogue.Observe fitting instructions for O-rings .]
13. Renew O-rings (B) and (F); for correct version refer to Electronic parts catalogue.
14. Lubricate O-rings lightly with refrigerant oil before installing .
15. Pay attention to correct positioning of retaining plate (D) on connecting pipes (C) and (E) to evaporator.
16. Tighten bolts (G).
17. Install refrigerant lines to battery cooling module in luggage compartment .
18. Re-install remaining components (removed earlier).
19. 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)]
20. ⚠ 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.
21. Switch on ignition.
22. Interrogate event memory of operating and display unit (Climatronic control unit J255) and erase any entries 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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