Skoda Fabia Radiator: Specs, Fitment & Common Faults

If your Fabia has a TSI turbo engine, VW Group has legally admitted to using "inferior thermoplastic materials" in the water pump housing — a real class-action settlement covers this.

Illustration for editorial purposes

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OEM Part Number: 5Q0121251T (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 65327 / NRF 550194

Accuracy note: Covers the Skoda Fabia (Mk3 2014-2021) as listed in the UK aftermarket catalogues. Radiators are sold by engine, gearbox and air-conditioning fitment, and one model usually has two or three different cores — a thicker core for diesels and automatics, a thinner one for small petrols — with different hose positions, so a radiator for the wrong engine will not connect up. The references below are UK aftermarket listings whose fitment lists name this generation, labelled by brand with the core size in mm; genuine numbers are those quoted against the listing. Check your engine code and whether the car has air conditioning against your VIN, and replace the coolant and bleed the system after fitting.

Radiators (aftermarket)	Nissens 65327 (650 x 415 x 23 mm, aluminium core with plastic tanks, mechanically jointed fins, 1.6 MPI CWVA); NRF 550194; Van Wezel 58012711; Prasco SK328R001; Kamoka 7705231; AKS Dasis 040101N
Core sizes & variants	The 1.6 MPI takes the 650 x 415 x 23 mm radiator shared with the Octavia III and Golf VII 1.6. The far more common UK engines, the 1.0 MPI, 1.0 TSI, 1.2 TSI and 1.4 TDI, use the smaller Polo-type radiator from the 6C0121253 family, which was not confirmed here.
Genuine (OE) numbers quoted	5Q0121251T; 5Q0121251HC
Fitment notes	Hose connections are 32.5 mm. Fabia III owners with the three-cylinder or 1.2 TSI engines should order against the VIN, since the 1.6 MPI radiator will not fit them.

Accuracy note: genuinely worth knowing: radiator core size and construction can differ between petrol and diesel Fabia engines, and again between manual and automatic gearboxes where the automatic needs an integrated oil cooler circuit — confirm your exact engine code and transmission before ordering.

Confirmed: A Genuinely Serious, Class-Action-Level Design Flaw on TSI Engines — Skoda Fabia Radiator

If your car has a TSI turbo petrol engine, this is genuinely the single most important thing to know before anything else on this page. The water pump and thermostat are combined into one integrated plastic housing, and this plastic becomes brittle and develops hairline cracks after thousands of ordinary heat cycles — leading to a coolant leak that's often difficult to spot at first. This isn't a minor manufacturing quirk: VW Group (Skoda's parent company) has confirmed through legal documents that "inferior thermoplastic materials were used" in these water pump components, and the issue has been the subject of multiple class-action lawsuits.

What the settlement genuinely offers: a Technical Service Bulletin extends the warranty on this specific part to 8 years/80,000 miles, and the class-action settlement goes further still — up to 10 years/100,000 miles warranty, reimbursement of qualifying repairs, and reimbursement for consequential damage if the leak went undiagnosed long enough to damage the turbocharger or EGR system.

Separately, if you've already replaced the water pump, cambelt, and thermostat and are still losing coolant with no visible leak anywhere, it's genuinely worth checking the EGR cooler specifically — coolant can leak through a failing EGR cooler with no outward signs at all, since it flows internally into the exhaust rather than dripping visibly. This is often only confirmable by removing the exhaust downpipe and checking for coolant residue.

Skoda Fabia Radiator: The Part That Keeps Everything Else From Cooking

Nothing about this component is glamorous, but on the Skoda Fabia, almost every serious engine failure that isn't wear-related traces back to a cooling system problem left unaddressed. Catching the early signs here is genuinely cheap insurance against a much bigger bill.

Skoda Fabia Radiator: Watch: Replacing It

🎬 Watch: How to replace Volkswagen polo tsi 6r 6c 1.2 1.4 radiator and condenser (sister (vw polo 6r/6c))

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Fabia Mk3 sits on the Polo 6C PQ26 platform

Before you buy: radiator size and design vary significantly by engine size, transmission type, and whether your car has air conditioning. Always confirm against your VIN before ordering.

Skoda Fabia Radiator: What It Does

The Skoda Fabia's radiator transfers heat from the engine coolant to the surrounding air, keeping engine temperature within a safe operating range. On automatic versions, it often also cools transmission fluid through a separate internal circuit — one more reason the correct part number matters so much here.

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Skoda Fabia Radiator: Faults, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Radiator Guide for the three common failure modes, confirming fitment against your VIN, and OEM vs aftermarket guidance.

More Skoda Radiator

The same part, covered across other Skoda models.