Volkswagen Polo Radiator: Specs, Fitment & Common Faults

If your Polo has a TSI turbo engine, VW 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: 6R0121253D (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 65293 / Valeo 701331

Accuracy note: Covers the Volkswagen Polo (6R/6C 2009-2017) 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)	Magneti Marelli BM1679 (655 x 388 x 23 mm, aluminium core with plastic tanks, mechanically jointed fins, fits 1.6 TDI CAYA/CAYB/CAYC, 1.4 GTI, 1.8 GTI and R WRC); Nissens 65293 (648 x 396 x 26 mm, soldered core, supplied with seals); NRF 59056; Valeo 701331; Denso DRM32051; Mahle CR 2425 000S; Van Wezel 76002021; Ava SA2021
Core sizes & variants	The diesel and GTI Polo 6R/6C share a 650 mm class radiator with the Audi A1 8X and Seat Ibiza 6J. The 1.2 and 1.4 naturally aspirated petrols and the 1.2 TSI use a smaller radiator under a different genuine number, so the engine code decides which is needed.
Genuine (OE) numbers quoted	6R0121253D; 6R0121253G; 6R0121253H; 6R0121253R
Fitment notes	Connections on the Nissens unit are 32 mm and it is supplied with seals.

Accuracy note: genuinely worth knowing: whether a Polo has air conditioning or a larger optional engine can change radiator sizing on some variants — fitment guides that only ask for model and year can still get this wrong, so cross-check the engine code where possible.

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

If your car has a TSI turbo petrol engine (particularly the EA888 family used across much of VW's range from around 2015 onward), 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 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 VW's 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 crucially, reimbursement of up to £3,300 for consequential damage if the leak went undiagnosed long enough to damage the turbocharger or EGR system. If you've paid for this repair or suffered related engine damage, it's genuinely worth checking whether you qualify before assuming the cost is yours to bear.

Watch for a low coolant warning, a sweet smell in the engine bay (especially after motorway driving), or fault codes P00B7, P2681, P1889, or P0128 — any of these are worth investigating immediately rather than topping up and continuing, since this failure can escalate from a slow leak to sudden, severe overheating within minutes. If this does need replacing, the entire water pump and thermostat housing assembly must be replaced together — never just one part of it.

Volkswagen Polo Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Volkswagen Polo's cooling system sits behind nearly every serious engine failure that isn't just ordinary wear — and one that went unaddressed for too long. Noticing early warning signs here is a small cost against a potentially very large one.

Volkswagen Polo Radiator: Watch: Replacing It

🎬 Watch: How to replace Volkswagen polo tsi 6r 6c 1.2 1.4 radiator and condenser

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Covers both 6R and 6C

Volkswagen Polo Radiator reference plate

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.

Volkswagen Polo Radiator: What It Does

On the Volkswagen Polo, engine coolant sheds its heat into the passing air via the radiator, which is what keeps engine temperature in a safe working range. On automatics, it frequently pulls double duty cooling the transmission fluid through its own internal circuit — a detail that makes getting the exact part number right especially important.

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Volkswagen Polo 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 Volkswagen Radiator

The same part, covered across other Volkswagen models.