Ford C-Max Radiator: Specs, Fitment & Common Faults

The C-Max's 1.0 EcoBoost shares a well-documented degas bottle cracking issue with several other Ford models — referenced even in a UK Parliament document.

Illustration for editorial purposes

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OEM Part Number: 8V618005CA (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 66869 / Valeo 701675

Accuracy note: Covers the Ford C-Max (2010-2019) 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 66869 (545 x 362 x 26 mm, aluminium core, plastic tanks, 33 mm connections, fits 1.6 TDCi 95 PS T3DA/T3DB and 115 PS T1DA/T1DB); Denso DRM10009; NRF 58289; Van Wezel 18012702; Ava FD2601; Hella 8MK 366 307-171; Kamoka 7700239. Nissens 66860 (543 x 362 x 26 mm, aluminium core, plastic tanks, 33.5 mm connections, fits 1.0 EcoBoost 100 and 125 PS, codes B3DA, B7DA, M1DA, M1DD, M2DA, M2DC); Denso DRM10028
Core sizes & variants	The 1.6 TDCi diesel and the 1.0 EcoBoost petrol use near-identical 26 mm cores of the same height but with different tank and connection layouts, so they are not interchangeable. The 1.6 Ti-VCT and EcoBoost 1.5 and 1.5/2.0 TDCi engines are not on these two fit lists.
Genuine (OE) numbers quoted	1.6 TDCi: 8V618005CA; 1684912; 1897411. 1.0 EcoBoost: CV618005VA; CV618005VB; CV618005VC; 1766348; 1804849; 1830145
Fitment notes	both are 5 mm fin-pitch soldered cores.

Accuracy note: genuinely worth knowing: radiator core size and construction can differ between petrol and diesel C-Max 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.

The 1.0 EcoBoost's Coolant Reservoir 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 C-Max Radiator: The Part That Keeps Everything Else From Cooking

There's nothing exciting about this component, yet on the Ford C-Max, 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.

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.

French; refitting a C-Max 1.6 TDCi radiator, generation not stated

Ford C-Max Radiator: What It Does

The Ford C-Max 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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Ford C-Max 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.