Detaching and attaching refrigerant lines at expansion valve (rear) — AUDI

🧭 Before you start

Fits: Audi Q7 (4M, 2015–)

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

Don't miss

• Danger from the escape of pressurised refrigerant.Frostbite on skin and other parts of the body.Only unfasten the screws on the joints after discharging the refrigerant circuit. — Switch off ignition.
• Seal off open connections in the lines at the connection point using clean plugs, e.g. from engine bung setVAS 6122.
• Observe fitting instructions for O-rings .Pay attention to correct positioning of the O-rings in the grooves of the connections.
• After attaching, check routing of refrigerant lines. They must be inserted tension-free in the brackets provided and should not make contact with other components.

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ Danger from the escape of pressurised refrigerant.Frostbite on skin and other parts of the body.Only unfasten the screws on the joints after discharging the refrigerant circuit. — Switch off ignition.
2. Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
3. Remove left underbody trim panels Body repairs, exterior66Underbody trim panels; Removing and installing underbody trim panels.
4. Remove heat shield for gearbox tunnel General body repairs, exterior66Strips / covers / extensions / trim panels; Removing and installing heat shield for floor.
5. Remove the heat protection mat on the left centre tunnel in the area around the gearbox from the vehicle.

6. Detach the bracket for the refrigerant lines on the underbody Exploded view - expansion valve and refrigerant lines to heater and air conditioning unit (rear).
7. Remove nuts (A).
8. Detach the refrigerant lines (B) and (C) from the expansion valve (D). [Note: Seal off open connections in the lines at the connection point using clean plugs, e.g. from engine bung setVAS 6122.]
9. Clean the refrigerant line connections at the expansion valve (D) and at the refrigerant lines (B) and (C) and check for damage.
10. Replace the O-rings (E) and (F); for correct version, refer to Electronic parts catalogue. [Note: Observe fitting instructions for O-rings .Pay attention to correct positioning of the O-rings in the grooves of the connections.]
11. Lubricate O-rings (E) and (F) lightly with refrigerant oil before fitting Refrigerant circuit seals.
12. Insert the refrigerant lines (B) and (C) at the expansion valve.
13. Insert and tighten nuts (A). [Note: Install refrigerant lines so that they are free of stress.Following attachment to the expansion valve (F), check the routing of the refrigerant lines. They must be inserted in the holders provided and not make contact with other components.]
14. After attaching, check routing of refrigerant lines. They must be inserted tension-free in the brackets provided and should not make contact with other components.
15. Evacuate and charge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
16. Re-install remaining components (removed earlier).
17. Interrogate the event memory of the front air conditioner operating and display unit E87 and erase any faults displayed in "“Guided Fault Finding”" mode.
18. Start up air conditioner after charging refrigerant circuit Starting 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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