Subaru Impreza Radiator: Specs, Fitment & Common Faults

Confirmed on the EJ25-engined Impreza: Subaru has extended the warranty for a known head gasket issue on certain production dates — worth checking your manufacture date plate and a specific, characteristic leak location.

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OEM Part Number: 45111FL001 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606844 / NRF 550246

Accuracy note: Covers the Subaru Impreza (2017-) 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 606844 (660 x 392 x 16 mm, aluminium soldered core, plastic tanks, 2.0i FB20 petrol); NRF 550246; Hella 8MK 366 309-871; AKS Dasis 350002N; Maxgear AC230627; Hart 664 903.
Core sizes & variants	The fifth-generation Impreza and the XV share one single-row radiator for the 2.0 petrol; the 1.6i is not on this fit list.
Genuine (OE) numbers quoted	45111FL001
Fitment notes	Inlet and outlet are 39 mm. The 1.6i should be ordered against the VIN.

Accuracy note: genuinely worth knowing: radiator hose connection points and mounting brackets on the Impreza can differ subtly between facelifted and pre-facelift versions of the same generation, even when the core itself is unchanged.

Subaru Impreza Radiator: The Part That Keeps Everything Else From Cooking

This isn't a part anyone gets excited about, but on the Subaru Impreza, overlooked cooling problems are responsible for most serious engine failures that aren't simple wear-and-tear. Catching the early symptoms is about the cheapest insurance available against a major bill later.

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.

Subaru Impreza Radiator: What It Does

Keeping the Subaru Impreza's engine temperature within safe limits comes down to the radiator's job of transferring heat from the coolant into the surrounding air. Automatic-gearbox versions often build in a second circuit for transmission fluid cooling too, which is exactly why fitting the wrong part number can cause two problems, not one.

Subaru Impreza Radiator: Watch: Replacing It

🎬 Watch: How to Replace Radiator 2012-2016 Subaru Impreza (older gen)

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Fourth-gen Impreza; no clearly dated 2017- radiator swap found.

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Confirmed: A Genuine Extended Warranty Worth Checking Your Car Against — Subaru Impreza Radiator

This is genuinely worth checking directly if you're finding unexplained coolant drips on an older, EJ25-engined Impreza: head gasket seepage on this engine has a characteristic location worth checking first — drips appearing on the crossmember that the engine mounts attach to, with the bottom of the head itself feeling damp. Genuinely important to know: Subaru has extended the warranty specifically covering this known head gasket issue on certain production dates across this engine family, with documented cases seeing the gasket replaced completely free of charge under this extension. It's worth checking the manufacture date plate inside the driver's door frame and asking a dealer directly whether your specific car falls within the extended coverage window.

A genuinely useful diagnostic technique worth knowing if a standard test comes back negative: a standard hydrocarbon or block test can sometimes give a false negative even when a genuine head gasket leak is present. Using a no-spill coolant funnel fitted to the radiator cap opening while revving the engine and watching for bubbles has been documented catching leaks that a standard test missed.

It's also genuinely worth knowing that a Subaru-recommended coolant conditioner additive can delay head gasket seepage temporarily, but this is a delaying measure rather than a genuine fix. Real repair costs for this job have been documented in the region of £1,950 to £2,750 or more.

Subaru Impreza 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 Subaru Radiator

The same part, covered across other Subaru models.