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Details
| Specification | Value |
|---|---|
| Brand | Metalcaucho |
| Opening Temperature [°C] | 87 °C |
| Weight [kg] | 0.44 kg |
| Weight [g] | 440 g |
OE numbers (1)
Search by this OE number to find compatible parts
- SEAT / SKODA / VW—03C 121 111B
Where this part fits
Original-fit position for OE 03C121111B. The red ring marks where this part installs on the vehicle.
About this product
Sourced from Metalcaucho, this thermostat housing (03726) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Opening Temperature [°C]: 87 °C, Weight [kg]: 0, 44 kg, Supplementary Article/Supplementary Info: 35, Supplementary Article/Supplementary Info: 49, Weight [g]: 440 g — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit SEAT, SKODA, VW models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 03726, 03C 121 111B, 111 401, 128 228 0005 and 15 more. Matching these numbers confirms a like-for-like replacement with no loss of function. Metalcaucho is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched with tracked delivery and a 14-day money-back guarantee with hassle-free returns.
Thermostat Housing buying guide
Why replace this part?
The thermostat housing holds the thermostat and routes coolant between the engine and radiator. Plastic housings are prone to cracking with heat cycling, causing sudden coolant loss and rapid overheating.
Signs you need a replacement
- Coolant leak at the top of the engine near the thermostat
- rapid coolant loss
- white steam from under the bonnet
- engine temperature swings
- puddles of coolant after the engine warms up
When to replace
No fixed interval — plastic housings typically last 80,000–120,000 miles before cracking. Replace at first sign of leakage.
Suitable cars
Equivalent products (18)
Thermostat Housing Metalcaucho 03726 — compatible car models
| Car models | SEAT: CORDOBA (6L2), IBIZA III (6L1), IBIZA IV (6J5, 6P1), IBIZA IV SC (6J1, 6P5), IBIZA IV ST (6J8, 6P8), TOLEDO IV (KG3); SKODA: FABIA I (6Y2), FABIA I Combi (6Y5), FABIA II (542), FABIA II Combi (545), FABIA I Saloon (6Y3), RAPID (NH3, NK3, NK6), RAPID Spaceback (NH1), ROOMSTER (5J7), ROOMSTER Praktik (5J); VW: FOX Hatchback (5Z1, 5Z3, 5Z4), POLO (6N2), POLO III CLASSIC (6V2), POLO IV (9N, 9A), POLO IV Saloon (9A4, 9A2, 9N2, 9A6), POLO V (6R1, 6C1), POLO Variant (6V5) |
|---|---|
| Engines | 1.2; 1.4 16V; 1.4; 75 1.4 16V |
| Year of manufacture | 1995-2022 |
| Manufacturer article number (MPN) | 03726 |
| OE part numbers | 03C 121 111B |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
Metalcaucho 03726 . Opening Temperature [°C]: 87 °C. Supplementary Article/Info 2: 536. Supplementary Article/Supplementary Info: 35. Supplementary Article/Supplementary Info: 49. Weight [g]: 440 g. Weight [kg]: 0,44 kg
- 1x Thermostat Housing
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Tracked standard shipping.
- Standard delivery: 4–8 business days
- Order before 5pm — ships the next working day
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Thermostat Housing compatible with my car?
This Thermostat Housing fits SEAT, SKODA, VW vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this Metalcaucho Thermostat Housing have?
This Metalcaucho Thermostat Housing has the following specifications: Opening Temperature [°C]: 87 °C; Weight [kg]: 0,44 kg; Supplementary Article/Supplementary Info: 35; Supplementary Article/Supplementary Info: 49; Weight [g]: 440 g; Supplementary Article/Info 2: 536. Check the full specifications table above for complete details.
What OE part numbers does this Thermostat Housing replace?
This Thermostat Housing replaces OE part numbers: 03C 121 111B. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Thermostat Housing cost?
This Metalcaucho Thermostat Housing is available for £63.99. Thermostat Housing prices vary depending on brand, specifications, and vehicle compatibility. Metalcaucho parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Thermostat Housing?
Regular inspection of your Thermostat Housing is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Thermostat Housing?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Thermostat Housing fitted by a professional mechanic.
Can I use this part as a replacement for OE 03C 121 111B?
Yes, this Metalcaucho Thermostat Housing is a direct replacement for OE part number 03C 121 111B. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
