Ford Focus Mk3 Radiator: Specs, Fitment & Common Faults

The Mk3's 1.0 EcoBoost has a well-documented degas bottle cracking issue — serious enough to be referenced in a UK Parliament transport committee document.

Generation covered: this guide is for the third-generation Focus, built 2011–2018 (commonly the 2014–2018 registered examples still in daily use). The newer Mk4 Focus (2018–) uses different part numbers throughout — check your V5C logbook or VIN if you're unsure which generation you have.

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The 1.0 EcoBoost's Degas Bottle Has a Well-Documented Cracking Tendency

Across the 1.0 EcoBoost family generally (primarily 2012-2017 production), the plastic degas bottle (coolant reservoir) and its connecting hoses have a well-documented tendency to develop hairline cracks as the plastic ages and heat-cycles over years of use — serious enough that a UK Parliament transport committee document specifically references "failure of the degas pipe affecting 1.0L Fox engines" as a known issue Ford was asked to address. Watch for dropping coolant levels requiring more than one top-up between services, a sweet smell from the engine bay, or white smoke from the exhaust on starting — all worth investigating promptly rather than simply topping up and continuing to drive.

Worth knowing: a genuine UK recall (reference R/2020/089, 2020) also covered certain Kuga and Puma models specifically for a related coolant leak risk — worth checking your own registration via the DVSA recall checker even if your model wasn't part of that specific recall, since the underlying degas bottle weak point affects the wider 1.0 EcoBoost range.

Ford Focus Mk3 Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Ford Focus Mk3's cooling system sits behind nearly every serious engine failure that isn't just ordinary wear — and one that went unaddressed for too long. Noticing early warning signs here is a small cost against a potentially very large one.

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.

Ford Focus Mk3 Radiator: Watch: Replacing It

🎬 Watch: 2012–2018 Ford Focus Radiator Replacement (Step-by-Step DIY Guide)

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Alt 1A Auto: https://www.youtube.com/watch?v=RAIOmYAWdaU

OEM Part Number: CV618005VA (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 66860 / Valeo 701675

Accuracy note: Covers the Ford Focus Mk3 (Mk3 2011-2018) 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 66860 (543 x 362 x 26 mm, soldered aluminium core with plastic tanks, fits all 1.0 EcoBoost petrols 100, 125 and 140 PS, engine codes M2DA, M2DB, M2DC, SFDA, SFDB, M1DA, M1DC, M1DD, M1DH); Valeo 701675; Denso DRM10028; NRF 58650; Van Wezel 18002602; Hella 8MK 366 304-801; Magneti Marelli 350213173800. For the 1.5 EcoBoost and 2.0 TDCi: Nissens 606215 (670 x 449 x 26 mm, soldered aluminium core with plastic tanks, fits 1.5 EcoBoost 150 and 182 PS, 2.0 TDCi 150 PS and 2.0 TDCi ST 185 PS); Valeo 701364
Core sizes & variants	The 1.0 EcoBoost takes the smaller 543 x 362 mm radiator, which it shares with the C-MAX, Grand C-MAX, Tourneo Connect and Transit Connect. The 1.5 EcoBoost and 2.0 TDCi take the wider 670 x 449 mm radiator shared with the Kuga II. The 1.6 TDCi and 1.6 Ti-VCT use a different unit again, not covered here.
Genuine (OE) numbers quoted	1766348; 1804849; 1830145; CV618005VA; CV618005VB; CV618005VC (1.0 EcoBoost); 1857556; 1920192; 2237092; 2439725; EJ738005AF; EJ738005AG; EJ738005AH; EJ738005CA (1.5 EcoBoost / 2.0 TDCi)
Fitment notes	The 1.0 EcoBoost radiator has 33.5 mm connections; the 1.5/2.0 unit has 34.5 mm connections and comes with seals.

Ford revised the Focus Mk3's radiator part number more than once across its production run, and automatic-transmission cars use a version with an additional internal cooler circuit that manual cars don't have. Confirm your transmission type and engine before ordering, since the wrong version will fit physically but won't cool the transmission fluid correctly.

Ford Focus Mk3 Radiator: What It Does

On the Ford Focus Mk3, engine coolant sheds its heat into the passing air via the radiator, which is what keeps engine temperature in a safe working range. On automatics, it frequently pulls double duty cooling the transmission fluid through its own internal circuit — a detail that makes getting the exact part number right especially important.

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Ford Focus Mk3 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 Ford Radiator

The same part, covered across other Ford models.