Citroen C4 Radiator: Specs, Fitment & Common Faults

On the C4, a genuinely specific detail before DIY thermostat housing work: real torque figures that prevent over-tightening from causing the exact leak you're trying to fix.

Generation covered: this guide is for the current C4 (launched 2021, facelifted 2024), with particular focus on 2021–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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A Genuinely Specific Detail Worth Knowing Before DIY Thermostat Housing Work

If you're replacing the thermostat housing yourself, it's genuinely worth knowing a specific detail that catches many DIYers out: on several engines in this range, the housing is secured directly onto the cylinder head with a thin bead of RTV sealant rather than a conventional gasket, using a relatively large number of bolts (commonly 8) tightened to a comparatively light torque figure — documented at around 8Nm on some engines — rather than fewer bolts at high clamping force. Over-tightening these bolts, assuming a higher torque figure "seems safer," can actually crack the housing or distort its sealing surface, causing exactly the leak you were trying to fix. Confirming the genuine torque specification and sealing method for your specific engine before starting is worth doing rather than guessing.

A genuinely distinct leak point worth checking separately: the corrugated rubber pipe connecting the water pump to the thermostat housing, which runs behind the engine, is a separate, well-documented leak point in its own right — distinct from the housing or pump themselves. If you've replaced the housing and pump but coolant is still disappearing, this specific pipe is worth checking directly before assuming a more complex fault.

It's also worth knowing that a genuine air lock trapped in the system after any coolant work is a common cause of the same overheating symptoms as a faulty thermostat or pump — always follow the correct bleeding procedure for your specific engine after any repair in this area.

Citroen C4 Radiator: The Part That Keeps Everything Else From Cooking

It's an unglamorous part, but on the Citroen C4, 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.

Citroen C4 Radiator: Watch: Replacing It

🎬 Watch: Замена радиатора Citroen C4 (для gregorygorbital) (older gen)

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Russian, previous-gen C4; nothing found for the 2021 C4 III

OEM Part Number: 9825333880 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 607246 / Van Wezel 09012718

Accuracy note: Covers the Citroen C4 (III 2020 on) 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)	Van Wezel 09012718 (380 x 540 x 26 mm, 28 mm inlet and outlet, quick-fit connectors, 1.5 BlueHDi 130); Nissens 607246
Core sizes & variants	The 380 x 540 mm core is listed for the 1.5 BlueHDi diesel and is shared with the DS 3 Crossback in both PureTech petrol and BlueHDi forms. A separate radiator for the C4 III 1.2 PureTech petrol and the e-C4 electric was not confirmed
Genuine (OE) numbers quoted	9825333880; 1680410980
Fitment notes	Hose connections are 28 mm with QF (quick-fit) couplings, so the original clips should be reused or replaced. Diesel fitment is confirmed; petrol and electric C4 III owners should order against the VIN.

Accuracy note: genuinely worth knowing: some C4 engines pair the radiator with an integrated oil cooler or a separate charge-air cooler depending on turbocharging — these aren't interchangeable, so confirm your exact engine spec before ordering.

Radiator specification varies significantly between petrol/mild-hybrid and fully electric ë-C4 versions — the electric version uses an entirely different cooling architecture for its battery and motor rather than a conventional engine radiator. Confirm your exact powertrain before ordering.

Citroen C4 Radiator: What It Does

On the Citroen C4, 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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Citroen C4 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 Citroen Radiator

The same part, covered across other Citroen models.