Removing and installing refrigerant lines with internal heat exchanger — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020); platform code 85

• Opens: refrigerant (A/C)
• Renewed: o-rings
• Also covered elsewhere: Electronic parts catalogue

Don't miss

• Lubricate O-rings with refrigerant oil before installing .Make sure O-rings are seated correctly in groove of corresponding refrigerant line.
• Routing and attaching refrigerant lines

📋 Procedure

1. ⚠ Danger from escaping pressurised refrigerant.Frostbite on skin and other parts of the body.Extract the refrigerant and then immediately open up the refrigerant circuit.Extract the refrigerant again if more than 10 minutes have passed since the initial extraction and the refrigerant circuit has not been opened up. Renewed evaporation leads to the build-up of pressure in the refrigerant circuit. — Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit (Air conditioner with refrigerant R134a; Refrigerant circuit; Working with the air conditioner service station).
2. Unfasten hose clips (1, 2) and remove air pipe.
3. Press release tabs at crankcase breather hose (1) and detach hose from cylinder head cover.
4. Move vacuum hoses clear at air pipe (arrows).
5. Loosen hose clip (3).

6. Unscrew bolt (2), swivel air pipe with connection to the rear and detach from turbocharger.
7. Unfasten bracket (A) (for coolant valve for high-voltage battery N688) from plenum chamber partition panel.
8. Unfasten heat shield (B) from plenum chamber partition panel in vicinity of N541(D) and refrigerant line (F) (to connection point on right longitudinal member) and carefully bend it back.
9. Remove speed nuts (1 and 3).
10. Fold heat shield (2) as far forwards as possible (arrow).
11. Remove bolt (7).
12. Detach refrigerant line (6) with internal heat exchanger from expansion valve.
13. Unscrew nuts (1, 3) and detach refrigerant lines (2, 4).
14. Take refrigerant line (5) with internal heat exchanger out towards right side.
15. Seal off open lines and connections with clean plugs from engine bung setVAS 6122.
16. Renew O-rings; for correct version, refer to Electronic parts catalogue.
17. Clean connections on expansion valve (2) and on internal heat exchanger (4) and check for damage.
18. Thoroughly clean connection area of refrigerant lines and check for damage. [Note: Lubricate O-rings with refrigerant oil before installing .Make sure O-rings are seated correctly in groove of corresponding refrigerant line.]
19. Insert O-rings (1 and 3) in grooves at connection of internal heat exchanger.
20. Insert internal heat exchanger at expansion valve.
21. Tighten bolt (5).
22. Clean connections on refrigerant lines and check for damage.
23. If fitted, check that dowel pin (4) is not damaged and is seated correctly.
24. Check guide ring (2) at refrigerant line connection for damage. [Note: Lubricate O-rings with refrigerant oil before installing .Make sure O-rings are seated correctly in groove of corresponding refrigerant line.]
25. Insert O-ring (3) in groove (arrow) in connection for refrigerant line (1).
26. Insert refrigerant lines in corresponding connections.
27. Tighten bolts. [Note: Routing and attaching refrigerant lines]
28. Evacuate and charge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit (Air conditioner with refrigerant R134a; Refrigerant circuit; Working with air conditioner service station).
29. Start up air conditioner after charging refrigerant circuit .
30. As a final step, interrogate event memory and erase any entries displayed ("“Guided Fault Finding”").

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