Kia Ceed Radiator: Specs, Fitment & Common Faults

On the Ceed, a radiator, thermostat, and housing were all replaced on a related model, yet the coolant smell genuinely persisted, pointing toward the heater core.

Illustration for editorial purposes

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OEM Part Number: 25310A6150 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 675038 / Valeo 701452

Accuracy note: Covers the Kia Ceed (2012-2018) 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 675038 (550 x 397 x 16 mm, aluminium core with plastic tanks, integral oil cooler, 1.6 CVVT G4FC and 1.6 GDI G4FD petrol); NRF 59255; Mahle CR 1976 000P; Van Wezel 82002436; Hella 8MK 366 308-491; Nissens 67608 (480 x 389 x 26 mm, integral oil cooler, 1.4 CRDi D4FC and 1.6 CRDi D4FB diesel); Valeo 701452; Mahle CR 1694 000S
Core sizes & variants	The 1.6 petrol engines take a 550 x 397 x 16 mm radiator with a built-in transmission oil cooler, while the 1.4 and 1.6 CRDi diesels take a thicker 480 x 389 x 26 mm unit, also with an oil cooler. The 1.4 petrol and 1.6 T-GDI GT use different radiators not covered here.
Genuine (OE) numbers quoted	25310A6150 (petrol); 25310A5850; 25310A5950 (diesel)
Fitment notes	The petrol radiator has a 35 mm inlet and 33 mm outlet; the diesel unit has 35 mm connections both ends and comes with gaskets and seals. Both are shared with the Hyundai i30 (GD) of the same years.

Accuracy note: genuinely worth knowing: whether a Ceed 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.

A Genuinely Honest Account Worth Knowing If the Smell Persists — Kia Ceed Radiator

This is genuinely worth knowing if you're chasing a coolant smell that won't go away: one documented case on a related model saw the radiator, thermostat, and thermostat housing all replaced in turn, with the car not overheating, yet the smell of coolant persisted after driving. If you've replaced the obvious components and the smell remains, it's genuinely worth having the heater core checked specifically.

A genuinely useful diagnostic distinction worth knowing: a leak from the water pump's weep hole tends to show ongoing, visible wetness, whereas a leak from a plastic radiator tank seal can dry up quickly once system pressure is released, making it considerably harder to spot on a static inspection.

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.

Kia Ceed Radiator: The Part That Keeps Everything Else From Cooking

It's an unglamorous part, but on the Kia Ceed, 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.

Kia Ceed Radiator: Watch: Replacing It

🎬 Watch: How to change the radiator and coolant on the HYUNDAI I30 CW [AUTODOC TUTORIAL] (sister (hyundai i30))

Watch on YouTube ↗

Autodoc i30 estate guide, likely FD/GD gen which shares the Ceed JD 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.

Kia Ceed Radiator: What It Does

On the Kia Ceed, 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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Kia Ceed 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 Kia Radiator

The same part, covered across other Kia models.