Removing and installing coolant pipe (bottom): Audi A4 Cabriolet B6/B7 / A4 B6/B7 (AEB, AJL, ALT, ALZ, …)

🧭 Before you start

Fits: Audi A4 Cabriolet B6/B7 (8H), Audi A4 B6/B7 (8E)

• Opens: coolant
• Renewed: o-ring

Don't miss

• When installing air intake hoses with plug-in connectors, ensure that the securing clip (arrow) engages audibly on the retaining lug (A).

🔧 Engine codes this applies to

📋 Procedure

1. Drain off coolant .
2. Unclip cover caps.
3. Unscrew nuts (arrows) and detach engine cover panel. Also pull out dipstick if necessary.
4. Remove insulation beneath cover panel (if fitted).
5. Unplug electrical connector (1).

6. Move aside fuel hoses at air pipe.
7. Remove bolt (2).
8. Remove air pipe (arrows).
9. Unclip fuel pipe brackets (1) at bottom coolant pipe.
10. Detach coolant hoses (2) and (3).
11. Move wiring clear of bottom coolant pipe.
12. Unscrew bolts (1) and (2) and pull coolant pipe out of cylinder block (arrow). [Note: Renew O-ring.Hose connections and hoses for charge air system must be free of oil and grease before assembly.Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.To ensure that the charge air hoses can be properly secured at their connections, spray rust remover onto the worm thread of used hose clips before installing.]
13. Clean and smoothen sealing surface for O-ring as required.
14. Lubricate new O-ring (1) with coolant additive and slide onto coolant pipe.
15. Push coolant pipe into bore on cylinder block.
16. When installing air intake hoses with plug-in connectors, ensure that the securing clip (arrow) engages audibly on the retaining lug (A).
17. Fill cooling system .

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