Renault Megane Radiator: Specs, Fitment & Common Faults

On the Megane, a genuinely well-corroborated diagnosis: "95% chance it's the thermostat housing" — a cheap, common fix worth knowing.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — radiators (aftermarket) Nissens 606473 / Valeo 701683

Accuracy note: Covers the Renault Megane (Mk4 2016-) 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 606473 (539 x 432 x 26 mm, brazed aluminium with plastic tanks, 1.2 TCe 100/115/130, 1.3 TCe 100/115/140/160, 1.5 dCi 90/95/110); Valeo 701683; Valeo 701183; Denso DRM23114; NRF 59273; Ava RT2648; Van Wezel 43012710; Hella 8MK 366 303-601
Core sizes & variants	One 539 x 432 mm, 26 mm-deep core covers the TCe petrols and the 1.5 dCi, manual and EDC.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order a genuine unit against your VIN
Fitment notes	35 mm inlet and outlet; seal supply is not stated, so budget for new hose O-rings.

Accuracy note: genuinely worth knowing: coolant capacity and radiator sizing on the Megane tend to track engine displacement and power output closely — a part correct for a smaller-engined version of the same model can undersize the cooling for a larger-engined one.

A Genuinely Well-Corroborated Diagnosis Worth Knowing: The Thermostat Housing — Renault Megane Radiator

If your car has the 0.9 or 1.2 TCe engine and you're chasing a slow coolant leak, this is genuinely worth knowing directly: one owner's own assessment after extensive research put it plainly — "95% chance it is thermostat housing." This is a well-documented, common failure point on these engines, and genuinely good news on cost: one documented repair came to around £85-100.

A genuinely useful diagnostic insight worth knowing: a coolant leak that seems to disappear entirely over summer, then returns once temperatures drop in winter, is a real, documented pattern — rubber components expand slightly when warm, which can temporarily seal a very small crack or hole, only for it to re-open as the material contracts in colder weather. If your leak seems to have "fixed itself" only to return months later, this genuinely explains why.

It's also genuinely worth knowing you're not imagining a problem if this feels like a common complaint: multiple owners and independent motoring columns have confirmed that this generation of small turbocharged engines leaks coolant in significant numbers, and if a dealer is dismissive of a genuine, repeated coolant loss without a proper investigation, it's worth pushing back rather than accepting a simple "topped up, no fault found" response.

Renault Megane Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Renault Megane's cooling system sits behind nearly every serious engine failure that isn't just ordinary wear — and one that went unaddressed for too long. Noticing early warning signs here is a small cost against a potentially very large one.

Renault Megane Radiator: Watch: Replacing It

🎬 Watch: bodgit and leggit garage how to remove/install renault megane radiator (older gen)

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Pre-Mk4 Megane; no Mk4 radiator video found.

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.

Renault Megane Radiator: What It Does

On the Renault Megane, engine coolant sheds its heat into the passing air via the radiator, which is what keeps engine temperature in a safe working range. On automatics, it frequently pulls double duty cooling the transmission fluid through its own internal circuit — a detail that makes getting the exact part number right especially important.

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Renault Megane 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 Renault Radiator

The same part, covered across other Renault models.