Vauxhall Meriva Radiator: Specs, Fitment & Common Faults

A failing expansion tank cap seal is a well-documented, often-overlooked cause of coolant loss on the Meriva — worth checking before assuming a leak elsewhere.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — radiators (aftermarket) Nissens 630735 / NRF 58473

Accuracy note: Covers the Vauxhall Meriva (B 2010-2017) 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 630735 (470 x 409 x 26 mm, without sealing cap, with thermostat, without gasket/seal); Nissens 630736 (470 x 409 x 26 mm, without sealing cap, without gasket/seal); Nissens 630734 (469 x 409 x 16 mm, without sealing cap, with thermostat, without gasket/seal); NRF 58473 (470 x 430 x 26 mm); NRF 58473A (470 x 430 x 24 mm); NRF 58477 (470 x 430 x 16 mm); NRF 53008 (470 x 430 x 26 mm, for vehicles with combined radiator/ oil cooler)
Core sizes & variants	470 mm wide core; 16 mm for the 1.4 petrols and 26 mm for the 1.3/1.7 CDTi diesels and turbo petrols. Some versions carry a thermostat housing on the radiator.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order a genuine unit against your VIN
Fitment notes	The automatic takes the version with the combined oil cooler; check for the thermostat fitting before ordering.

Accuracy note: genuinely worth knowing: many Meriva radiators are engine-code specific rather than universal across the range — the engine code is usually stamped on the block or listed on the VIN plate, and it's the most reliable way to confirm fitment.

A Genuinely Overlooked Cause of "Mystery" Coolant Loss — Vauxhall Meriva Radiator

If coolant keeps disappearing with no visible leak underneath the car, it's genuinely worth checking the expansion tank cap itself before assuming a more expensive fault. A failing seal in the cap is a well-documented, commonly overlooked cause of coolant loss and a hissing sound once the engine's hot — and it's often overlooked in favour of investigating the thermostat or head gasket first, even though it's a genuinely cheap part to simply replace and rule out.

A genuinely useful filling technique: air pockets trapped in the cooling system during a refill are a common, underappreciated cause of overheating symptoms and a coolant level that seems to disappear — filling too quickly is the usual cause. Adding coolant slowly, almost dribbling it in, gives trapped air a proper chance to escape rather than getting sealed into a pocket that later causes symptoms that look exactly like a leak or failing thermostat.

Vauxhall Meriva Radiator: The Part That Keeps Everything Else From Cooking

This isn't a part anyone gets excited about, but on the Vauxhall Meriva, 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.

Vauxhall Meriva Radiator: Watch: Replacing It

🎬 Watch: vauxhall / Opel meriva B, 1.4 petrol turbo radiator / intercooler replacement.

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Alt step-by-step (gen unstated): https://www.youtube.com/watch?v=x-Lc7cld4e0

Vauxhall Meriva Radiator reference plate

Vauxhall Meriva Radiator: What It Does

Keeping the Vauxhall Meriva'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.

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Vauxhall Meriva 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 Vauxhall Radiator

The same part, covered across other Vauxhall models.