Removing and installing air supply unit (vehicles with 6-cylinder and 8-cylinder petrol engines) — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

• Special tools named: puller

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• Shown with bumper removed for ease of illustration.

📋 Procedure

1. Position vehicle on lifting platform .
2. Bleed system .
3. Remove wheel trim; on light-alloy wheels, pull off trim cap (use puller in vehicle tool kit).
4. Remove front left wheel.
5. Secure brake disc with one wheel bolt.

6. Vehicles with auxiliary heater: Unscrew bolts (arrows) from exhaust pipe at noise insulation.
7. Unfasten quick-release fasteners (1) and (2) and remove noise insulation.
8. Unscrew bolts (1) from wheel housing liner (front section).
9. Unscrew two bolts (arrows) from wheel housing liner (front section).
10. Unscrew top bolt (arrow) from wheel housing liner (front section). [Note: Press in clamping pins on wheel housing liners only approx. 5 mm into expanding clips, and not all the way through.This releases the expanding clip so it can be pulled out.On installation, the clamping pin is pushed back and the expanding clip can be reused.]
11. Using a screwdriver, press clamping pins of expanding clips (1) on wheel housing liner (front section) approx. 5 mm deep into expanding clips.
12. Pull out expanding clip.
13. Remove expanding clip (arrow) in upper section of wheel housing liner (front) in the same way.
14. Remove expanding clip (arrow) in rear section of wheel housing liner (front) (1) in the same way.
15. Remove nut (1).
16. Unplug connectors (2).
17. Unfasten clip (1) and detach intake hose (2) from connecting piece (3).
18. Unscrew air pipe from air supply unit (arrow).
19. Unscrew nuts (4) and take out air supply unit. [Note: Shown with bumper removed for ease of illustration.]
20. Screw on nuts (4) for air supply unit .
21. Screw on air pipe (arrow) at air supply unit .
22. Fasten clip (1) and attach intake hose (2) to connecting piece (3).
23. Install nut (1).
24. Plug in connectors (2).
25. Install front noise insulation 50.
26. Fit wheel housing liner 66.
27. Fit and secure wheel Wheels and tyres44.
28. Charge system .
29. Set down vehicle on its wheels .

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