BMW 1 Series Radiator: Specs, Fitment & Common Faults

On the 1 Series, 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 1 Series (F40, 2019–present), with particular focus on 2019–2023 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: 17118586324 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 60862 / Mahle CR 2642 000P

Accuracy note: Covers the BMW 1 Series (F40 2019 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 60862 (195 x 202 x 26 mm core as listed, aluminium soldered core with plastic tanks, 116i/118i/120i/128ti and M135i xDrive with the B38 1.5 and B48 2.0 petrol engines); Mahle CR 2642 000P; NRF 550235; Hella 8MK 366 300-351; Van Wezel 06012728; Magneti Marelli 350213214500; Prasco BM127R001. Nissens 606789 (680 x 299 x 26 mm, aluminium core, plastic tanks, 118d, 120d and 120d xDrive with the B47 2.0 diesel); Mahle CR 2749 000P
Core sizes & variants	The F40 uses three different radiators. All petrol models share one unit; the 2.0 B47 diesels (118d, 120d) take a 26 mm-thick core and the 1.5 B37 diesel (116d) a thinner 22 mm core of the same face size.
Genuine (OE) numbers quoted	17118586324 and 8586324 (B47 diesel unit); 17118586321 (B37 diesel unit); none quoted for the petrol unit
Fitment notes	All three Nissens units are supplied with seals; inlet and outlet are 32.5 mm on both diesel radiators. The petrol and diesel radiators are not interchangeable, so match the engine code.

Accuracy note: genuinely worth knowing: BMW sometimes fits a heavier-duty radiator as standard on 1 Series trims with towing packs or higher-accessory-load options — worth confirming your exact spec rather than assuming the base-model rating applies.

BMW 1 Series Radiator: The Part That Keeps Everything Else From Cooking

There's nothing exciting about this component, yet on the BMW 1 Series, 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 1 Series Radiator: What It Does

The BMW 1 Series 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 1 Series Radiator: Watch: Replacing It

🎬 Watch: BMW Radiator removal 1 or 3series or X1. I change out & reinstall my BMW radiator e87 e90 e84 (older gen)

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E87 rear-drive 1 Series; no F40 radiator video found, only F40 coolant-tank location clips.

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A Genuinely Honest, Real Cost Finding Worth Knowing — BMW 1 Series 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 1 Series 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.