Skoda Rapid Radiator: Specs, Fitment & Common Faults

If your Rapid 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: 6C0121253A (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606809 / Valeo 701758

Accuracy note: Covers the Skoda Rapid (2012-2019) 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 606809 (650 x 321 x 32 mm, soldered aluminium core, plastic tanks, fits 1.6 TDI 90/105/115 PS, engine codes CAYB, CAYC, CLNA, CXMA); Valeo 701758; Mahle CR 2222 000P; NRF 550256; Van Wezel 03012701; Ava AI2450; Hella 8MK 366 308-521.
Core sizes & variants	The 1.6 TDI takes a 650 x 321 x 32 mm core with 32.5 mm connections, shared with the Audi A1 and Seat Toledo IV.
Genuine (OE) numbers quoted	6C0121253A
Fitment notes	Supplied with gaskets and seals. NRF 550256 is the budget equivalent at the same core size.

Accuracy note: genuinely worth knowing: some Rapid engines pair the radiator with an integrated oil cooler or a separate charge-air cooler depending on turbocharging — these aren't interchangeable, so confirm your exact engine spec before ordering.

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

It's an unglamorous part, but on the Skoda Rapid, the cooling system is behind almost every serious non-wear engine failure that could have been prevented. Spotting trouble here early is about as cheap an insurance policy as exists against a genuinely expensive repair bill.

Skoda Rapid Radiator: Watch: Replacing It

🎬 Watch: Skoda Rapid Petrol Radiator Removal

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Likely the Indian-market Rapid (Polo-sedan based) rather than the European NH; front-end layout is near identical.

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 Rapid Radiator: What It Does

On the Skoda Rapid, heat from the engine coolant is shed to the surrounding air through the radiator, keeping engine temperature in a safe range. On automatic gearboxes, it often doubles up, cooling transmission fluid through a separate internal circuit too — which is why getting the exact part number right matters more here than on a simple heat exchanger.

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Skoda Rapid 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.