Mercedes-Benz C-Class Radiator: Specs, Fitment & Common Faults
A genuinely alarming, honest account: a water pump and thermostat housing failed together on a genuinely young car, just four years old, quoted at around £550 — Mercedes-Benz UK offered a genuine 50% goodwill discount specifically on the water pump.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — radiators (aftermarket) Nissens 627029 / Valeo 735285
| Radiators (aftermarket) | Nissens 627029 (640 x 432 x 16 mm, without sealing cap, without gasket/seal); Nissens 627033 (640 x 432 x 26 mm, without sealing cap, without gasket/seal); Valeo 735285 (451 x 640 x 23 mm, for vehicles without oil cooler); Valeo 701142 (438 x 640 x 26 mm, for vehicles without oil cooler, without coolant regulator); Denso DRM17103 (640 x 436 x 28 mm); NRF 50040 (640 x 438 x 26 mm); NRF 550243 (640 x 430 x 26 mm); Mahle CR 2100 000P (640 x 446 x 16 mm) |
|---|---|
| Core sizes & variants | All 640 mm wide; 16 mm cores for the smaller petrols and 26-28 mm cores for the diesels and larger engines. |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order a genuine unit against your VIN |
| Fitment notes | Many W205 variants have a separate low-temperature radiator for the intercooler circuit; these listings are the main engine radiator only. |
Mercedes-Benz C-Class Radiator: The Part That Keeps Everything Else From Cooking
This isn't a part anyone gets excited about, but on the Mercedes-Benz C-Class, overlooked cooling problems are responsible for most serious engine failures that aren't simple wear-and-tear. Catching the early symptoms is about the cheapest insurance available against a major bill later.
Mercedes-Benz C-Class Radiator: What It Does
Keeping the Mercedes-Benz C-Class's engine temperature within safe limits comes down to the radiator's job of transferring heat from the coolant into the surrounding air. Automatic-gearbox versions often build in a second circuit for transmission fluid cooling too, which is exactly why fitting the wrong part number can cause two problems, not one.
Mercedes-Benz C-Class Radiator: Watch: Replacing It
V6 W205; four-cylinder layout similar
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A Genuinely Alarming, Honest Real Account Worth Knowing — Mercedes-Benz C-Class Radiator
If a water pump and thermostat housing have both been found leaking at the same time, this is genuinely worth knowing: one documented case saw exactly this happen on a genuinely young car, just four years old with only around 32,000 miles on the clock, with the total cost to fix both quoted at around £550. Worth knowing that Mercedes-Benz UK offered a genuine 50% goodwill discount specifically on the water pump element of this repair, on the basis that it had failed earlier than would reasonably be expected, though the thermostat housing wasn't offered the same reduction — worth directly asking for this kind of goodwill discount if you're facing a similar early failure on a comparatively young or low-mileage car, since it's been granted in at least one documented case.
It's also genuinely worth knowing that driving with a significant coolant leak is strongly discouraged, since overheating can quickly lead to severe and expensive engine damage, including a warped cylinder head or a blown head gasket — worth having any coolant leak addressed promptly rather than simply topping up and continuing to drive.
Mercedes-Benz C-Class 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 Mercedes-Benz Radiator
The same part, covered across other Mercedes-Benz models.