Kia Soul Radiator: Specs, Fitment & Common Faults

On the Soul, 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: 25310B2400 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 666204 / NRF 59356

Accuracy note: Covers the Kia Soul (2014-2019) 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 666204 (480 x 411 x 26 mm, aluminium core, plastic tanks, 35.5 mm connections, fits 1.6 CRDi 128 and 136 D4FB); NRF 59356; Van Wezel 83012721; AKS Dasis 560131N; Moca RAD35094. Nissens 666205 (480 x 411 x 26 mm, same construction, 1.6 CRDi D4FB, alternative OE fitment); NRF 550178; Van Wezel 83012722; AKS Dasis 560132N. Nissens 666206 (553 x 400 x 28 mm, aluminium core, plastic tanks, 33 mm connections, fits 1.6 CVVT G4FG and 1.6 GDI G4FD petrol)
Core sizes & variants	The diesel uses a 480 x 411 mm core in two OE versions (25310B2400 and 25310B2450), which usually follow manual against automatic gearbox, so check the original part number before ordering. The petrol takes a larger 553 x 400 x 28 mm radiator.
Genuine (OE) numbers quoted	Diesel: 25310B2400; 25310B2450. Petrol: 25310B2300
Fitment notes	Match engine, gearbox and air-con fitment.

Accuracy note: genuinely worth knowing: automatic gearbox Souls 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 Honest Account Worth Knowing If the Smell Persists — Kia Soul 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 Soul Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the Kia Soul, 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.

Kia Soul Radiator: Watch: Replacing It

🎬 Watch: How to Replace Radiator 2014-2019 Kia Soul 1.6L L4

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1A Auto guide for PS-gen Soul

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 Soul Radiator: What It Does

On the Kia Soul, 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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Kia Soul 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.