Vauxhall Viva Radiator: Specs, Fitment & Common Faults

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

Illustration for editorial purposes

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OEM Part Number: 1300375 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 630796 / Denso DRM20127

Accuracy note: Covers the Vauxhall Viva (2015-2019) 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 630796 (520 x 368 x 16 mm, aluminium core, plastic tanks, 34 mm connections, supplied with seals, fits 1.0 B10XE 75 PS, 1.0 D10XE 73 PS and 1.0 LPG B10XL); Denso DRM20127; NRF 550121; Ava OL2706; Van Wezel 37012721; AKS Dasis 150148N; ERA 673431
Core sizes & variants	One 16 mm radiator covers every Viva, petrol and LPG, with or without the Easytronic automated gearbox.
Genuine (OE) numbers quoted	1300375; 95437450
Fitment notes	Supplied with gaskets and seals; the 34 mm hose connections are the same top and bottom.

Accuracy note: genuinely worth knowing: Vauxhall radiator part numbers for the Viva 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.

A Genuinely Common Cause of Coolant Loss Worth Checking First — Vauxhall Viva 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 Viva Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Vauxhall Viva'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.

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 Viva Radiator: Watch: Replacing It

🎬 Watch: Не сливается антифриз, как снять радиатор охлаждение на Chevrolet Spark Ravon R2 (sister (chevrolet spark))

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Russian; Ravon R2 is the previous-gen (M300) Spark, Viva is M400-based

Vauxhall Viva Radiator: What It Does

On the Vauxhall Viva, 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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Vauxhall Viva 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.