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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Vauxhall Mokka Radiator: OEM Part Number

Manual gearbox, all engines	Standard radiator with no transmission cooling circuit
Automatic, all engines	Genuinely uses a separate automatic transmission oil cooler component connected via pipes into the radiator's coolant circuit — confirmed as a distinct part from the radiator itself, listed under its own part numbers by engine code rather than a tank built into the radiator tank

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: 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.