Removing and installing coolant pipe (top left) - engine code letters BDG, BDH — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Opens: coolant
• Renewed: gaskets

Don't miss

• Renew gaskets, O-rings and self-locking nuts.Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.
• Before installing, clean and smoothen sealing surface for O-ring.

🔧 Engine codes this applies to

📐 7 workshop diagrams for AFB

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

📋 Procedure

1. Drain off coolant (see the separate procedure).
2. Remove engine cover panel; to do so, remove air cleaner cover and lift off engine cover panel.
3. Remove cover (arrow) at power steering fluid reservoir.
4. Disconnect coolant hoses (1 ... 3).
5. Unbolt coolant expansion tank (arrow).

6. Disconnect electrical connector for coolant shortage indicator switch F66 at bottom of coolant expansion tank and remove expansion tank.
7. Remove front exhaust pipe together with main catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive (see the separate procedure).
8. Remove starter catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive (see the separate procedure).
9. Detach vacuum hose (3).
10. Remove nuts (2) and bolts (1) and (4).
11. Remove mechanical exhaust gas recirculation valve together with connecting pipe.
12. Remove exhaust gas recirculation cooler (see the separate procedure).
13. Remove bolts (1) for exhauster pump with heat shield on cylinder head (left-side) and turn pump in direction of (arrow).
14. Remove exhauster pump.
15. Disconnect coolant hose (arrow) at coolant pipe (bottom left) from coolant pipe (front).
16. Disconnect coolant hoses (1) and (2) at coolant pipe (top left).
17. Remove bolt (3).
18. Remove coolant pipe (bottom left).
19. Disconnect coolant hose going to heat exchanger at coolant pipe (top left).
20. Slacken securing bolt (arrow) of coolant pipe (top left).
21. Pull coolant pipe (top left) to rear out of cylinder block.
22. Detach coolant pipe (top left). [Note: Renew gaskets, O-rings and self-locking nuts. Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.]
23. Before installing, clean and smoothen sealing surface for O-ring.
24. Lubricate new O-ring with “G12” and slide onto coolant pipe.
25. Push coolant pipe (top left) into bore on cylinder block.
26. Install exhaust gas recirculation cooler (see the separate procedure).
27. Install mechanical exhaust gas recirculation valve (see the separate procedure).
28. Install starter catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive (see the separate procedure).
29. Install front exhaust pipe together with main catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive (see the separate procedure).
30. Fill cooling system (see the separate procedure).

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