Removing and installing non-return valve with vacuum hose in engine compartment - 3.0 ltr. TDI engine — AUDI
Removing and installing non-return valve with vacuum hose in engine compartment - 3.0 ltr. TDI engine on Audi: 13 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–)
- Renewed: o-rings
Don't miss
- Risk of damage to vacuum hosesDisconnect vacuum hoses carefully. Damaged vacuum hoses must be renewed. — Pull off vacuum hose (2).
- Renew O-rings.To facilitate installation, moisten the vacuum hose with water, but not with oil.
📋 Procedure
- Remove air cleaner housing 23Air cleaner; Removing and installing air cleaner housing.
- Remove bracket for air conditioner compressor 13Cylinder block (pulley end); Removing and installing bracket for ancillaries.
- Detach filler cap (2).
- Release catch (1), turn filler pipe (3) in direction of (arrow) and detach.
- Close oil filler neck with filler cap.
- Release hose clip (arrow) and disconnect air hose.
- Pull cover (1) off ball studs (arrows) and detach.
- ⚠ Risk of damage to vacuum hosesDisconnect vacuum hoses carefully. Damaged vacuum hoses must be renewed. — Pull off vacuum hose (2).
- Remove bolt (1).
- Press release tabs on both sides and disconnect vacuum hose (3).
- Remove bolt (2) and detach vacuum hose (1) with non-return valve. [Note: Renew O-rings.To facilitate installation, moisten the vacuum hose with water, but not with oil.]
- Install bracket for air conditioner compressor 13Cylinder block (pulley end); Removing and installing bracket for ancillaries.
- Install air cleaner housing 23Air cleaner; Removing and installing air cleaner housing.
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
- Dismantling and assembling centre differential housing
- Operation of and removing/installing heater coolant shut-off valve N279
- Dismantling and assembling evaporator housing of air conditioning unit (front)
- Servicing ceramic brakes
- Removing and installing brake shoes - all models and ceramic brakes
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.