Removing and installing coolant pipes (top left and bottom left) — AUDI

🧭 Before you start

Drain the coolant, remove the oil filter bracket, coolant hoses and expansion tank with its F66 switch connector. Free the wiring, unbolt the heat shield and disconnect the hoses from the pipes, then pull the upper pipe rearwards out of the block and lift it out, followed by the bottom pipe. On refit, clean and smooth the O-ring seat, lubricate a new O-ring with coolant, slide the pipe into its bore, refit the oil filter bracket and refill with coolant.

Fits: Audi A4 B5 (8D)

• Opens: coolant
• Renewed: self-locking nuts, seals

Don't miss

• Renew self-locking nuts, seals and O-rings on the coolant pipes.
• Clean and smooth the O-ring sealing surface before fitting the pipe.
• Lubricate the O-ring with coolant, not grease, before sliding the pipe into the block.
• Bleed and check the cooling system for leaks after refilling, as general practice.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

1. Drain coolant .
2. Remove oil filter bracket .
3. Remove coolant hoses (2).
4. Unbolt coolant expansion tank (arrows 1).
5. Disconnect electrical wiring at coolant shortage indicator switch F66 and detach coolant expansion tank.

6. Disconnect coolant hoses (1) and (2) at coolant pipe.
7. Remove bolt (3). [Note: Illustration shows coolant pipe with engine removed.]
8. Release cable tie (2) at rear of heat shield and move wiring clear.
9. Unbolt heat shield (3) from intermediate flange (arrows) and remove.
10. Disconnect coolant hoses (1) and (4) from coolant pipes.
11. Pull coolant pipe to rear out of cylinder block.
12. Swivel rear part of coolant pipe to top right and remove.
13. Disconnect coolant hose (arrow).
14. Remove coolant pipe (bottom left). [Note: Renew self-locking nuts.Renew seals and O-rings.]
15. Install coolant pipe (bottom).
16. Clean and smoothen sealing surface for O-ring.
17. Lubricate O-ring with coolant and slide onto coolant pipe.
18. Slide coolant pipe (top) into bore in cylinder block.
19. Install oil filter bracket .
20. Fill up with coolant .

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