Removing and installing bottom coolant pipe - vehicles with engine code letters AJM — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Opens: coolant
• Renewed: o-ring

🔧 Engine codes this applies to

📐 9 workshop diagrams for AJM

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Drain off coolant .
2. Pull dipstick (1) out of guide tube.
3. Unclip cover caps.
4. Unfasten nuts (arrows) and detach engine cover.
5. Remove insulation beneath cover.

6. Re-insert dipstick in guide tube.
7. Disconnect vent pipe (1) leading to air cleaner and vacuum line (2) leading to mechanical EGR valve.
8. Loosen hose clip (3) to remove air intake hose at intake connecting pipe.
9. Unplug electrical connectors (2) and (4).
10. Detach vacuum hose (5).
11. Unscrew bolt (1).
12. Remove air pipe (3).
13. Detach coolant hoses (1) and (3).
14. Unbolt coolant expansion tank (2)(arrows).
15. Unplug electrical connector for coolant shortage indicator switch F66 at expansion tank (below).
16. Unclip fuel pipe brackets (1) at bottom coolant pipe.
17. Detach coolant hoses (2) and (3).
18. Unscrew bolts (1) and (2) and pull coolant pipe out of cylinder block (arrow). [Note: Renew O-ring.]
19. Clean and smoothen sealing surface for O-ring as required.
20. Lubricate new O-ring with “G12” and slide onto coolant pipe.
21. Push coolant pipe into bore on cylinder block.
22. Fill cooling system .

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