Skoda Superb Radiator: Specs, Fitment & Common Faults

The Superb's TSI engine shares a water pump housing VW Group has legally admitted used "inferior thermoplastic materials" — a real class-action settlement covers this.

Illustration for editorial purposes

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OEM Part Number: 5Q0121253J (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606644 additional radiator / Valeo 701429

Accuracy note: Covers the Skoda Superb (Mk3 2015-) 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 606644 additional radiator (195 x 186 x 26 mm, aluminium core, plastic tanks, 20 mm connections, supplied with seals, fits 2.0 TSI 4x4 272 PS DNUA and 280 PS CJXA/DNFE); NRF 550287; Mahle CR 1966 000P; Van Wezel 58012720; Hella 8MK 366 307-681; Ava VN2460; Kamoka 7705228. Nissens 60372 additional radiator (215 x 188 x 26 mm, same construction, fits 2.0 TSI 4x4 280 PS CJXA/DNFE); NRF 59125
Core sizes & variants	The small 195 x 186 mm and 215 x 188 mm units are the supplementary radiators mounted beside the main cooling pack on the 2.0 TSI 4x4 cars.
Genuine (OE) numbers quoted	Additional radiator: 5Q0121253J
Fitment notes	Order the main radiator against the VIN and quote the 5Q0121251 suffix stamped on the old tank, because the MQB platform uses several lengths and thicknesses depending on engine and gearbox.

Accuracy note: genuinely worth knowing: coolant capacity and radiator sizing on the Superb tend to track engine displacement and power output closely — a part correct for a smaller-engined version of the same model can undersize the cooling for a larger-engined one.

Confirmed: A Genuinely Serious, Class-Action-Level Design Flaw on TSI Engines — Skoda Superb 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 Superb Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the Skoda Superb, a neglected cooling system is behind the vast majority of avoidable serious engine failures. Noticing the early warning signs costs nothing and can save a genuinely large repair bill down the line.

MQB radiator pack refit in crash repair; nothing on Superb 3 itself

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 Superb Radiator: What It Does

On the Skoda Superb, coolant runs through the radiator to shed engine heat into the airflow, keeping temperatures in check. On many automatics, a separate internal circuit inside the same unit also cools the transmission fluid — one more reason a mismatched part number causes more than just a cooling problem.

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Skoda Superb 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.