Citroen C5 Aircross Radiator: Specs, Fitment & Common Faults

On the C5 Aircross, 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.

Illustration for editorial purposes

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OEM Part Number: 9809141780 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 636014 / Valeo 735555

Accuracy note: Covers the Citroen C5 Aircross (2018-) 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 636014 (650 x 433 x 18 mm, without gasket/seal); Nissens 636042 (648 x 408 x 26 mm, without cap, without expansion tank, with gaskets/seals); Nissens 606342 (650 x 433 x 26 mm, without cap, without expansion tank, with gaskets/seals); Valeo 735555 (650 x 433 x 18 mm, for vehicles without oil cooler); NRF 59355 (648 x 408 x 26 mm); NRF 59302A (650 x 408 x 32 mm); NRF 59302 (650 x 408 x 16 mm); NRF 550261 (647 x 430 x 26 mm, with gaskets/seals)
Core sizes & variants	All around 650 mm wide; depth varies between 16, 18, 26 and 32 mm by engine. Shared with the Peugeot 3008 and 308 on the EMP2 platform.
Genuine (OE) numbers quoted	9809141780
Fitment notes	Shared EMP2 radiator with Peugeot 3008 II and 308 II, so stock is plentiful; quote the engine code to pick the right core depth.

Accuracy note: genuinely worth knowing: radiator core size and construction can differ between petrol and diesel C5 Aircross engines, and again between manual and automatic gearboxes where the automatic needs an integrated oil cooler circuit — confirm your exact engine code and transmission before ordering.

A Genuinely Specific Detail Worth Knowing Before DIY Thermostat Housing Work — Citroen C5 Aircross Radiator

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 C5 Aircross Radiator: The Part That Keeps Everything Else From Cooking

There's nothing exciting about this component, yet on the Citroen C5 Aircross, most catastrophic engine failures that aren't simply down to wear trace back to a cooling problem someone ignored too long. Catching it early is cheap; catching it late usually isn't.

Citroen C5 Aircross Radiator: Watch: Replacing It

🎬 Watch: Citroen C5 Radiator replacement (sister (citroen c5 saloon, older pf3 platform, not emp2))

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Nothing found for C5 Aircross or 3008/5008; closest Citroen job, treat as general guidance only

Citroen C5 Aircross Radiator reference plate

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 C5 Aircross Radiator: What It Does

The Citroen C5 Aircross radiator's core job is moving heat out of the engine coolant and into the passing air, holding engine temperature within safe limits. Automatic versions frequently add a second internal circuit for transmission fluid cooling, which is exactly why the correct part number carries extra weight on this component.

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Citroen C5 Aircross 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.