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

Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH on Audi: 15 steps, engines AFB, AKE, AKN, AYM.

Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.

15 steps 9 engine codes engine codes merged from 2 documented variants

🧭 Before you start

Fits: Audi A6 C5 (4B)

  • Opens: coolant

Don't miss

  • Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.

🔧 Engine codes this applies to

AFBAKEAKNAYMBAUBCZBDGBDHBFC

📐 7 workshop diagrams for AFB

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

Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 1
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 2
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 3
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 4
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 5
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 6
Removing and installing coolant pipe (bottom left) - engine code letters BDG, BDH — AFB · diagram 7
🔒 7 workshop diagrams for this job Ask about your Audi AFB — free or sign up free to see the drawings

📋 Procedure

  1. Drain off coolant .
  2. Remove front exhaust pipe together with main catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive .
  3. Remove starter catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive .
  4. Remove exhaust gas recirculation cooler .
  5. Remove cover (arrow) at power steering fluid reservoir.
AFB? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Disconnect coolant hoses (1 ... 3).
  2. Unbolt coolant expansion tank (arrow).
  3. Disconnect electrical connector for coolant shortage indicator switch F66 at bottom of coolant expansion tank and remove expansion tank.
  4. Unscrew bolt (3) and also bolt at rear of exhauster pump.
  5. Disconnect coolant hose (arrow) at coolant pipe (bottom left) from coolant pipe (front).
  6. Remove coolant pipe (bottom left). [Note: Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.]
  7. Install exhaust gas recirculation cooler .
  8. Install starter catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive .
  9. Install front exhaust pipe together with main catalytic converter: vehicles with front-wheel drive , vehicles with four-wheel drive .
  10. Fill cooling system .
Workshop diagrams

Ask TorqFix about your Audi AFB — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.

Ask about your Audi AFB — free → or sign up free to see the drawings

Other AUDI procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.