Vauxhall Mokka Radiator: Specs, Fitment & Common Faults

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

Illustration for editorial purposes

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OEM Part Number: 1300343 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 630775 / Valeo 701746

Accuracy note: Covers the Vauxhall Mokka (2012-2019) 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 630775 (620 x 507 x 26 mm, soldered aluminium core, plastic tanks, fits 1.7 CDTI 131 PS A17DTS, 2WD and 4x4); Valeo 701746; NRF 59316; Van Wezel 37002665; Hella 8MK 366 312-451; Prasco OP700R006. Nissens 630777 (620 x 507 x 26 mm, soldered aluminium core, plastic tanks, fits 1.7 CDTI 131 PS A17DTS, 2WD and 4x4); NRF 59362; Van Wezel 37002655
Core sizes & variants	Both 1.7 CDTI radiators share the same 620 x 507 x 26 mm core and 34.5/38.5 mm connections but carry different OE numbers, which most likely splits manual from automatic, so quote the VIN.
Genuine (OE) numbers quoted	1300343, 1300349, 95081724, 95136073 (630775); 1300344, 1300351, 95081725, 95136074 (630777)
Fitment notes	The same radiators fit the Chevrolet Trax 1.7 TD.

Accuracy note: genuinely worth knowing: automatic gearbox Mokkas typically need a radiator with a built-in transmission oil cooler that manual versions don't have — ordering the manual-spec part for an automatic car will fit, but won't cool the gearbox oil properly.

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

It's an unglamorous part, but on the Vauxhall Mokka, the cooling system is behind almost every serious non-wear engine failure that could have been prevented. Spotting trouble here early is about as cheap an insurance policy as exists against a genuinely expensive repair bill.

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 Mokka Radiator: Watch: Replacing It

🎬 Watch: Buick Encore Radiator Replacement How to 2016 Model (sister (buick encore / chevrolet trax))

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Encore is the US-market twin of the Mokka on the Gamma II platform; only cooling-service and coolant-leak videos exist for the Mokka itself.

Vauxhall Mokka Radiator: What It Does

On the Vauxhall Mokka, heat from the engine coolant is shed to the surrounding air through the radiator, keeping engine temperature in a safe range. On automatic gearboxes, it often doubles up, cooling transmission fluid through a separate internal circuit too — which is why getting the exact part number right matters more here than on a simple heat exchanger.

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Vauxhall Mokka 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.