BMW X1 Radiator: Specs, Fitment & Common Faults

On the X1, the water pump is genuinely often the first cooling component to fail on related models, typically costing £300-£500 to replace.

BMW X1 (F48 2015 ON) radiator, core 682 x 299 mm, OEM 17118586321, aftermarket Nissens 606391

Illustration for editorial purposes

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OEM Part Number: 17118586321 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606391 / Mahle CR 2748 000P

Accuracy note: Covers the BMW X1 (F48 2015-) 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 606391 (682 x 299 x 22 mm, soldered aluminium core, plastic tanks, fits sDrive 16d B37 and sDrive/xDrive 18d B47 diesels); Mahle CR 2748 000P; NRF 550362; Van Wezel 06012745; Hella 8MK 366 304-521. Nissens 60865 (682 x 326 x 26 mm, soldered aluminium core, plastic tanks, fits sDrive 20i and xDrive 20i 192 PS B48); Mahle CR 2311 000P; Van Wezel 06012724; Prasco BM200R007.
Core sizes & variants	The diesels take the narrower 299 mm core with 32.5 mm connections; the 2.0 petrol takes the deeper 326 x 26 mm core. The F48 also carries a small separate auxiliary radiator (Nissens 60862, 195 x 202 x 26 mm, 16.3 mm connections) on the 18i, 20i, 25i and 25e petrol and hybrid models, which is a different part from the main radiator.
Genuine (OE) numbers quoted	17118586321 (diesel); 17117635620 and 7635620 (petrol); 17117634565 and 7634565 (auxiliary radiator)
Fitment notes	Nissens 60865 and 60862 are supplied with gaskets and seals; The same radiators are shared with the F45/F46 2 Series Tourers, F39 X2 and F54-F60 MINI, so prices are competitive.

Accuracy note: genuinely worth knowing: BMW radiator part numbers for the X1 frequently change mid-generation as engines are updated or facelifted, so a part valid for an early build year may not fit a later one even within the same model name.

BMW X1 Radiator: The Part That Keeps Everything Else From Cooking

It's an unglamorous part, but on the BMW X1, 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.

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 X1 Radiator: What It Does

On the BMW X1, 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.

BMW X1 Radiator: Watch: Replacing It

🎬 Watch: BMW X1 E84 18d Radiator replacement (older gen)

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E84 first-gen X1; F48 searches only returned fan, expansion tank and thermostat videos.

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A Genuinely Honest, Real Cost Finding Worth Knowing — BMW X1 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 X1 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.