Removing and installing refrigerant shut-off valve for heater and air conditioner unit N541 — AUDI

🧭 Before you start

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

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

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• Counterhold N541(D) and loosen union nuts (E).
• Observe fitting instructions for O-rings (B).After attaching, check routing of refrigerant lines. They must be inserted in brackets provided and should not make contact with other components.
• When tightening the union nuts, make sure not to strain the refrigerant lines.After attaching, check routing of refrigerant lines. They must be inserted in brackets provided and should not make contact with other components.

📋 Procedure

1. Switch off ignition.
2. Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit (Air conditioner with refrigerant R134a; Refrigerant circuit; Working with the air conditioner service station).
3. ⚠ 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. — Unfasten bracket (A) (for coolant valve for high-voltage battery N688) from plenum chamber partition panel.
4. 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.
5. Remove speed nuts (1 and 3).

6. Fold heat shield (2) as far forwards as possible (and necessary) (arrow).
7. Unplug electrical connector (C) for N541(D).
8. Counterhold N541(D) and loosen union nuts (E).
9. Unfasten refrigerant line (F) (to connection point on right longitudinal member) from bracket on plenum chamber partition panel.
10. Remove shut-off valve N541(D). [Note: Observe fitting instructions for O-rings (B).After attaching, check routing of refrigerant lines. They must be inserted in brackets provided and should not make contact with other components.]
11. Renew O-rings (B); for correct version refer to Electronic parts catalogue.
12. Screw in union nuts (E) by hand until they make contact.
13. Secure refrigerant line (F) (to connection point on right longitudinal member) in bracket on plenum chamber partition panel.
14. Counterhold N541(D) and tighten union nuts (E); make sure refrigerant lines are routed without tension. [Note: When tightening the union nuts, make sure not to strain the refrigerant lines.After attaching, check routing of refrigerant lines. They must be inserted in brackets provided and should not make contact with other components.]
15. Evacuate and charge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit (Air conditioner with refrigerant R134a; Refrigerant circuit; Working with the air conditioner service station).
16. Switch on ignition.
17. Interrogate event memory of operating unit (Climatronic control unit J255) and erase any entries displayed ("“Guided Fault Finding”").
18. 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 (before using air conditioner after system has been re-charged).]

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