Hyundai i20 Radiator: Specs, Fitment & Common Faults

On the i20, a leak specifically from the weep hole near the A/C compressor genuinely points toward a failing water pump seal.

Illustration for editorial purposes

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OEM Part Number: 25310C8000 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 675072 / Denso DRM41035

Accuracy note: Covers the Hyundai i20 (2014-2020) 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)	Van Wezel 82012723 (500 x 380 x 16 mm, aluminium core with plastic tanks, 1.2 G4LA and 1.4 G4LC petrol); Nissens 675072; NRF 59263; Ava HY2494; Mahle CR 2104 000S; Hella 8MK 366 304-911; Prasco HN204R003; Nissens 606735 (480 x 374 x 26 mm, 1.0 T-GDI G3LC)
Core sizes & variants	The naturally aspirated 1.2 and 1.4 petrol engines take the 500 x 380 x 16 mm radiator, while the 1.0 T-GDI turbo takes a thicker 480 x 374 x 26 mm unit, so the two are not interchangeable. The 1.1 and 1.4 CRDi diesels use a different radiator again, not covered here.
Genuine (OE) numbers quoted	25310C8000 (1.2/1.4); 25310C8400 (1.0 T-GDI)
Fitment notes	The 1.2/1.4 radiator has a 35 mm inlet and 33 mm outlet; the 1.0 T-GDI unit has 35 mm connections both ends and is supplied with gaskets and seals.

Accuracy note: genuinely worth knowing: automatic gearbox i20s typically need a radiator with a built-in transmission oil cooler that manual versions don't have — ordering the manual-spec part for an automatic car will fit, but won't cool the gearbox oil properly.

A Genuinely Useful Diagnostic Detail Worth Knowing — Hyundai i20 Radiator

If you're trying to pin down exactly where a coolant leak is coming from, this is genuinely worth knowing: a leak specifically from the small weep hole in the engine block near the A/C compressor points toward a failing water pump seal rather than a more general leak elsewhere.

A genuinely honest point worth knowing even after a recent water pump replacement: if a leak returns despite a relatively recent replacement, internal seals or bearings within even a new pump can occasionally be compromised, or the pump can be damaged by an unrelated issue. It's worth checking the timing belt tensioner and pulleys for wear at the same time, since improper belt tension can itself damage an otherwise sound water pump.

It's also worth knowing that the thermostat housing sits toward the front of the engine, higher up than where normal AC condensation would appear — worth checking this specific area if you're unsure whether water underneath the car is genuine coolant or harmless condensation.

Hyundai i20 Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Hyundai i20'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.

Hyundai i20 Radiator: Watch: Replacing It

🎬 Watch: Hyundai i20 Radiator replacement

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Generation not stated in title; verify it is the GB (2014-2020) car

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.

Hyundai i20 Radiator: What It Does

On the Hyundai i20, 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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Hyundai i20 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 Hyundai Radiator

The same part, covered across other Hyundai models.