Removing and installing thermostat (extended circuit) — VW
Removing and installing thermostat (extended circuit) on VW: 19 steps, engines CHYA, CHYB. What to remove, in what order, and 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 Polo 6C (2014–2017)
- Opens: coolant
Don't miss
- Centring pin of thermostat must accurately be fitted into guide (arrow) on thermostat housing (1).
- Ensure proper seating of gasket.
📋 Procedure
- Drain coolant Draining and filling coolant.
- Pull hose (1) off air filter housing.
- Pull air filter housing upwards off studs at positions (2) and (3).
- Push air filter housing and intake connecting pipe in (direction of arrow) out of mounting (4).
- Remove air filter housing from engine compartment.
- Loosen clamp (4) and disconnect hose (3).
- Remove bolts (arrows).
- Remove cover (2).
- Remove thermostat using special wrench T10508.
- Slightly push down special wrench T10508 while turning it in direction of (arrow).
- Centring pin of thermostat must accurately be fitted into guide (arrow) on thermostat housing (1).
- Install thermostat using special wrench T10508.
- Slightly push down special wrench T10508 while turning it to stop in direction of (arrow).
- Ensure proper seating of gasket.
- Moisten gasket with coolant.
- Fit cover (1) on thermostat housing.
- Thread and tighten securing bolts (A) through (D) in sequence given.
- Replenish coolant Draining and filling coolant.
- Install air filter housing Removing and installing air filter housing.
Other VW procedures
- Checking fuel pressure, vehicles with engine codes CWVA, CWVB, CHYA, CHYB
- Removing and installing camshaft housing
- Removing and installing engine control unit J623 with protective housing · 1 torque figures
- Removing and installing fuel tank, hatchback – VW Polo 6C 1.2
- Removing and installing camshaft oil seal, gearbox end · 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 → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.