Removing and installing coolant pipe (rear left) - vehicles from model year 2014 onwards — AUDI
Removing and installing coolant pipe (rear left) - vehicles from model year 2014 onwards on Audi: 10 steps, engines CDSB, CTEC.
On the Audi A8 D4 (4H) from model year 2014, with engine codes CDSB or CTEC, the rear-left coolant pipe sits at the back of the engine under the plenum chamber partition panel. After draining the coolant and removing the partition panel, the wiring harness is moved clear and the toothed belt cover is unbolted for access. The pipe is then unbolted from the left-hand coolant pipe and freed from its hoses by releasing two clips and lifting a retaining clip. Space is tight, so the harness has to be pushed aside with care. A new O-ring, original-type hose clips and new coolant are what keep it dry afterwards.
🧭 Before you start
Drain the coolant and remove the plenum chamber partition panel. Move the harness clear, remove the toothed belt cover, unbolt the pipe from the left-hand coolant pipe, release the hose clips and the retaining clip and lift it out. Refit with a new O-ring and correct clips, reinstall the toothed belt cover and fill with new coolant.
Fits: Audi A8 D4 (4H, 2010–2017)
- Opens: coolant
- Renewed: o-ring
Don't miss
- Fit a new O-ring on the pipe joint.
- Use original-type hose clips on every hose connection.
- Lift retaining clip (3) before pulling the pipe off the hoses.
- Refill with new coolant; drained coolant is not reused.
Written for this job from the workshop steps below · TorqFix editorial.
📋 Procedure
- Drain coolant .
- Remove plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - plenum chamber partition panel.
- Move clear electrical wiring harness.
- Remove bolts (arrows) and detach toothed belt cover (1).
- Remove bolts (arrows) and detach coolant pipe (rear left) from coolant pipe (left-side).
- Release hose clips (1, 2), lift retaining clip (3) and detach coolant pipe (rear left) from coolant hoses.
- Detach coolant pipe.
- If necessary, move electrical wiring harness clear and push slightly to one side. [Note: Fit new O-ring.Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.]
- Install toothed belt cover . [Note: Do not reuse coolant.]
- Fill up with coolant .
Other AUDI procedures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Exploded view - timing chain cover · 18 torque figures
- Removing and installing toothed belt for high-pressure pump · 3 torque figures
- Measuring radial clearance of camshaft – Audi A6/A7 C7 · 6 torque figures
- Renewing oil seal for toothed belt drive sprocket – Audi BMC
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
- Removing and installing fuel filter - A5 up to model year 2011, A4 up to model year 2012
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
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.