BMW X3 Radiator: Specs, Fitment & Common Faults

On the X3, the water pump is genuinely often the first cooling component to fail on related models, typically costing £300-£500 to replace.

Generation covered: this guide is for the third-generation X3 (G01, 2018–present), with particular focus on 2018–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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OEM Part Number: 17119886561 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 607205 / Van Wezel 06012743

Accuracy note: Covers the BMW X3 (G01 2017 on) 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 607205 (615 x 411 x 32 mm, aluminium core, plastic tanks, 38.5 mm connections, fits all B47 2.0d and B57 3.0d G01 variants 2017-2020 plus the X4 G02); Van Wezel 06012743; AKS Dasis 050160N; Bogap B4210152; Reach 1.40.24531.032. Nissens 607330 is the separate low-temperature auxiliary radiator (505 x 111 x 16 mm, all-aluminium, 16.3 mm connections) fitted to the mild-hybrid 18d, 20d, 30d and M40d
Core sizes & variants	All four- and six-cylinder diesels share the 615 x 411 mm main radiator; the mild-hybrid diesels add the slim 505 x 111 mm auxiliary cooler.
Genuine (OE) numbers quoted	17119886561; 9886561; 17118578142; 8578142; 17118472272; 8472272
Fitment notes	the auxiliary radiator is listed without OE numbers, so match it to the mild-hybrid designation (JA1) rather than the engine code alone.

Accuracy note: genuinely worth knowing: many X3 radiators are engine-code specific rather than universal across the range — the engine code is usually stamped on the block or listed on the VIN plate, and it's the most reliable way to confirm fitment.

BMW X3 Radiator: The Part That Keeps Everything Else From Cooking

There's nothing exciting about this component, yet on the BMW X3, most catastrophic engine failures that aren't simply down to wear trace back to a cooling problem someone ignored too long. Catching it early is cheap; catching it late usually isn't.

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.

BMW X3 Radiator: What It Does

The BMW X3 radiator's core job is moving heat out of the engine coolant and into the passing air, holding engine temperature within safe limits. Automatic versions frequently add a second internal circuit for transmission fluid cooling, which is exactly why the correct part number carries extra weight on this component.

BMW X3 Radiator: Watch: Replacing It

🎬 Watch: BMW X3 Radiator Replacement DIY (2018-2024 BMW G01 X3, G02 X4, M40i, B58 Engine)

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G01 B58; alt THRdwiNN5GU covers 2019 G01/G02

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A Genuinely Honest, Real Cost Finding Worth Knowing — BMW X3 Radiator

This is genuinely worth knowing about the water pump specifically: it's often the first cooling system component to fail on related BMW models, typically lasting around 60,000 to 80,000 miles, with a replacement typically costing around £300 to £500 in the UK including parts and labour.

A genuinely alarming, honest finding worth knowing: because every part in the cooling system shares the same pressure, one component failing often reveals the next one waiting to happen shortly after, worth having the whole system properly inspected rather than replacing just the one failed part.

It's also genuinely worth knowing that BMW engines are generally designed to run hotter than many other brands, accelerating wear on plastic cooling components, worth considering preventative replacement around the 80,000 mile mark.

BMW X3 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 BMW Radiator

The same part, covered across other BMW models.