Installing thermostat: VW 1.9 TDI (AVQ, BJB, BKC, BLS, …)
Step-by-step installing thermostat for the VW 1.9 TDI: 5 steps, 1 torque figure. What to remove, what to tighten and to how many Nm, what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Touran I (1T, 2003–2015), VW Golf V / Jetta (1K, 2003–2009), VW Passat B6 (3C, 2005–2010); platform code 5M1
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- The brace on the thermostat must be almost vertical.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 15 Nm (11 lb-ft) | Tighten securing bolts (1) |
ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.
📋 Procedure
- Moisten new O-ring (3) with coolant.
- Insert thermostat (4) into connection (2) and turn 1/4 turn (90°) clockwise. [Note: The brace on the thermostat must be almost vertical.]
- Insert connection (2) with thermostat (4) in cylinder block.
- Tighten securing bolts (1) to 15 Nm. — 15 Nm (11 lb-ft)
- Replenish coolant.
Other VW procedures
- Filling with coolant – VW Golf VII
- Checking delivery pressure – VW Golf V / Jetta
- Removing and installing pre-wired wiring harness for unit injectors and glow plugs · 1 torque figures
- Checking charge air system for leaks
- Removing and installing engine speed sender G28 – VW Polo 6R · 1 torque figures
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 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.