Removing and installing expansion valve with refrigerant shut-off valve 2 for hybrid battery N517, vehicles with high-voltage system — AUDI

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018); platform code 4X

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

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• Lubricate O-rings lightly with refrigerant oil before installing .

📋 Procedure

1. ⚠ Risk of fatal injury if high-voltage components are damaged.Observe the following when working in the vicinity of high-voltage components or wiring:It is not permitted to use cutting or forming tools, other sharp-edged tools or heat sources such as welding, brazing, soldering, hot air or thermal bonding equipment.Before starting work, visually inspect the high-voltage components in the areas involved.Before working in the engine compartment, visually inspect the power and control electronics for electric driveJX1, electric drive motor V141, air conditioner compressor V470 and high-voltage wiring. Before working on the vehicle underbody, visually inspect the high-voltage wiring and covers. Before working on the rear section of the vehicle, visually inspect the high-voltage wiring and the electro-box with the maintenance connector for high-voltage system TW . Visually inspect all potential equalisation lines.Check the following when making the visual inspection:There must be no external damage on any component. The insulation of the high-voltage wiring and potential equalisation lines must not be damaged. There must be no unusual deformation of the high-voltage wiring. All high-voltage components must be identified by a red warning sticker. — 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 bolt (2) and disconnect refrigerant line (1).
5. Remove bolt (3) and disconnect refrigerant line (4).

6. Seal off open lines and connections with clean plugs from engine bung setVAS 6122.
7. Take electrical connector (2) out of bracket and unplug.
8. Remove bolts (1).
9. Remove refrigerant shut-off valve 2 for hybrid battery N517(item 3) from refrigerant lines to evaporator.
10. Seal off open lines and connections with clean plugs from engine bung setVAS 6122.
11. 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 .]
12. Renew O-rings (B) and (F); for correct version refer to Electronic parts catalogue.
13. Lubricate O-rings lightly with refrigerant oil before installing .
14. Pay attention to correct positioning of retaining plate (D) on connecting pipes (C) and (E) to evaporator.
15. Tighten bolts (G).
16. Install refrigerant lines to battery cooling module in luggage compartment .
17. Evacuate and charge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
18. Re-install remaining components (removed earlier).
19. Switch on ignition.
20. Interrogate event memory of operating unit (Climatronic control unit J255) and erase any entries displayed ("“Guided Fault Finding”").
21. Start up air conditioner after charging refrigerant circuit . [Note: Also observe notes on starting up air conditioner after charging Air conditioner with refrigerant R134a87General notes on air conditioning systems.]

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