Vauxhall Adam Radiator: Specs, Fitment & Common Faults

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

Illustration for editorial purposes

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OEM Part Number: 39059781 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 630743 / Valeo 733114

Accuracy note: Covers the Vauxhall Adam (2013-2019) 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 630743 (540 x 378 x 23 mm, aluminium mechanically jointed core with plastic tanks, 34 mm inlet and outlet; fits the 1.2 69 PS A12XEL/B12XEL/D12XEL, 1.4 87 PS A14XEL and 1.4 101 PS A14XER, and 1.4 LPG, plus the Corsa D); Denso DRM20046; NRF 53115; Van Wezel 37002574; Valeo 733114; Mahle CR 1182 000S; Hella 8MK 366 301-841
Core sizes & variants	The naturally aspirated 1.2 and 1.4 Adams use the Corsa D type 540 x 378 x 23 mm radiator; the Adam S 1.4 Turbo uses the longer Corsa E type 620 x 366 x 22 mm radiator, which comes with its thermostat housing. The 1.0 Turbo three-cylinder was not confirmed.
Genuine (OE) numbers quoted	39059781 (Adam S 1.4 Turbo); none quoted for the 1.2/1.4 radiator
Fitment notes	Nissens 606390 includes the thermostat and seals

Accuracy note: genuinely worth knowing: whether a Adam has air conditioning or a larger optional engine can change radiator sizing on some variants — fitment guides that only ask for model and year can still get this wrong, so cross-check the engine code where possible.

A Genuinely Common, Overlooked Cause of "Mystery" Coolant Loss — Vauxhall Adam 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 Adam Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the Vauxhall Adam, 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.

Vauxhall Adam Radiator: Watch: Replacing It

🎬 Watch: Opel Corsa D Front Bumper , Coolant Radiator and Intercooler Replacement after hitting a stray dog (sister (vauxhall corsa d))

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Adam is Corsa D-based. German exact-model alt: -ywNGPtI9ZI (Opel ADAM defekten Kühler tauschen).

Vauxhall Adam Radiator: What It Does

On the Vauxhall Adam, 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.

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Vauxhall Adam 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.