Removing and installing heater coolant shut-off valve - vehicles with petrol engine — AUDI
Removing and installing heater coolant shut-off valve - vehicles with petrol engine on Audi: 17 steps.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi Q7 (4M, 2015–)
- Opens: coolant
- Special tools named: 3094
- Also covered elsewhere: Electronic parts catalogue
Don't miss
- Mark arrangement of coolant hoses at shut-off valve.
- Remove bolts (6) (counterhold nuts (3)).
📋 Procedure
- Switch off ignition (and auxiliary/supplementary heater).
- ⚠ The cooling system is pressurised. When the engine is warm, the coolant temperature may be above 90 °C. Release pressure and wait for temperature to drop before performing repairs. Release pressure in coolant circuit by opening cap on coolant expansion tank 19Cooling system/coolant; Draining and filling cooling system. — Release pressure in coolant circuit by opening cap on coolant expansion tank.
- Remove air cleaner housing 24Air cleaner; Removing and installing air cleaner housing.
- Remove secondary air pump and bracket 26Secondary air system; Exploded view - secondary air system.
- Clamp off coolant hose using hose clamp 3094.
- Mark arrangement of coolant hoses at shut-off valve.
- Clamp off coolant hoses using hose clamp 3094.
- Loosen hose clips and detach coolant hoses (1, 4, 6).
- Unplug electrical connector (3).
- Unscrew nuts (5 and 7).
- Remove shut-off valve (2).
- Loosen hose clips and detach coolant hoses (1, 5).
- Remove bolts (6) (counterhold nuts (3)).
- Detach shut-off valve (2) from bracket (4).
- ⚠ Ensure correct assignment of coolant hoses at shut-off valve. If coolant hoses are interchanged, this can cause the heating in the passenger compartment to fail. — Butt-joint coolant hoses and secure with standard hose clips at marked locations. For correct version of hose clip refer to Electronic parts catalogue.
- Bleed coolant circuit .
- If applicable, check activation and operation of heater coolant shut-off valve N279 ("“Guided Fault Finding”").
Other AUDI procedures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
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.