BMW 4 Series Radiator: Specs, Fitment & Common Faults

On the 4 Series, the water pump is genuinely often the first cooling component to fail on related models, typically costing £300-£500 to replace.

Illustration for editorial purposes

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OEM Part Number: 17118625426 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606513 / Valeo 735467

Accuracy note: Covers the BMW 4 Series (F32 2013-2020) 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 606513 (600 x 488 x 22 mm, brazed aluminium with plastic tanks, 420i and 430i B48); Ava BW2672; NRF 550328; Van Wezel 06012731; Prasco BM125R001; Vemo V20-60-0084; AKS Dasis 050125N. Nissens 606514 (600 x 478 x 32 mm, brazed aluminium with plastic tanks, 430i and 430i xDrive B48, plus 420i Gran Coupe); NRF 550254
Core sizes & variants	The B48 petrol cars take either the 22 mm-deep 606513 core or the 32 mm-deep 606514 core depending on specification, so the OE number on the old radiator decides it. The N20 428i and N57 430d also carry a small 185 x 156 mm auxiliary radiator (606270) alongside the main one. The 420d/425d N47 and B47 diesel main radiator is a separate part and is not covered here.
Genuine (OE) numbers quoted	17118625426; 8625426; 8482624; 17118482624 (606513); 17118652495; 8652495; 17118652499; 8652499 (606514); 17117600697 (606270)
Fitment notes	38.5 mm inlet and outlet on both main cores; 606514 is supplied with gaskets and seals, 606513 is not listed as including them. Order the diesel main radiator against the VIN.

Accuracy note: genuinely worth knowing: BMW radiator part numbers for the 4 Series 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 4 Series Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the BMW 4 Series, 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.

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 4 Series Radiator: What It Does

On the BMW 4 Series, 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.

BMW 4 Series Radiator: Watch: Replacing It

🎬 Watch: BMW F30 Radiator Replacement DIY (BMW N20 & N26 328i) (sister (bmw 3 series f30))

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F32 shares the F30 cooling pack; nothing titled F32.

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A Genuinely Honest, Real Cost Finding Worth Knowing — BMW 4 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 4 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.