83°C Opening Temperature Thermostat Housing with Integrated Design and OE Quality for VW Audi Seat Skoda EA111 Engines
A complete coolant regulation assembly that integrates the thermostat, housing, and outlet flange. Controls engine temperature by opening at 83°C to allow coolant flow to the radiator, preventing overheating. Ensures fast engine warm-up and consistent heater output for VAG 1.4 TSI EA111 engines.
The Thermostat, Housing & Coolant Flange Assembly (OEM: 03C121111AK / 03C 121 111 AK) is a premium-quality, integrated coolant control unit designed specifically for Volkswagen Group vehicles with EA111 1.4 TSI / 1.6 MPI / 1.4 MPI petrol engines. This complete assembly combines the thermostat, housing, and coolant outlet flange into one ready-to-install unit.
The integrated wax-type thermostat is calibrated to begin opening at 83°C, reaching full open at approximately 95–100°C. This ensures rapid engine warm-up when cold and proper cooling when at operating temperature.
• Thermostat stuck open – engine runs cold, poor fuel economy, lukewarm heater
• Thermostat stuck closed – rapid overheating, risk of engine damage
• Cracked housing – external coolant leaks, low coolant levels
| Part Number | 03C121111AK |
| Product Name | Thermostat Housing |
| Car Model | VW Audi Seat Skoda 1.4 TSI |
| Engine Model | EA111 |
| Opening Temperature | 83°C |
| Condition | 100% Brand New |
| Quality Standard | OEM equivalent / ISO quality control |
- OE Quality: Manufactured to strict VAG OEM dimensional and material standards
- Integrated Design: Complete all-in-one unit combining thermostat, housing, and coolant outlet flange
- Precision Wax Element: Consistent, repeatable opening characteristics with corrosion resistance
- 83°C Opening Temperature: Factory-spec calibration for optimal engine performance
- Critical Engine Protector: Prevents overheating and catastrophic engine damage
- Crack-Resistant Housing: High-quality engineered plastic resistant to warping and corrosion
- Restores Fuel Economy: Correct warm-up performance saves up to 15% in fuel consumption
- Ensures Cab Heating: Restores full heat output for driver comfort and safety
- Material Verification: Housing material tested to meet VW specifications
- Dimensional Accuracy: Verified against OE blueprints using CMM equipment
- Temperature Calibration: 100% sample-tested to open at 83°C ±2°C
- Leak Testing: Each unit 100% pressure-tested for zero leakage
- Thermal Cycle Endurance: Sample units tested through 50,000+ cycles
- IATF 16949 / ISO 9001:2015 Certified: International automotive quality standards
- Individual Packaging: Moisture-barrier VCI bag with OE-style labeling
- Gasket/Seal: O-ring (03C121119F) sold separately
- Hardware: Mounting bolts not included (reuse originals if in good condition)
- Bulk Orders: Available in case packs (10, 20, 50 units)
- Customization: Private-label packaging for volume orders
- Fast Shipping: Worldwide dispatch via express courier or sea freight
For pricing, availability, or bulk purchase of the Thermostat/Housing Assembly 03C121111AK for VW Golf, Passat, Tiguan, Audi A1, A3, SEAT Ibiza, Leon, Škoda Octavia, Yeti, and other VAG group vehicles with EA111 engines, please contact our sales team for competitive wholesale quotes and expert technical support.
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