Mercedes-Benz CLA Radiator: Specs, Fitment & Common Faults
A genuinely honest finding: a recurring coolant leak, even after a genuine water pump replacement, was suspected to be caused by an earlier repair using the wrong type of clamp on plastic coolant system parts.
Illustration for editorial purposes
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OEM Part Number: 2465001403 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 627063 / Valeo 701441
| Radiators (aftermarket) | Nissens 627063 (640 x 422 x 32 mm, soldered aluminium core, plastic tanks, fits CLA 220 4Matic 184 PS and CLA 250/250 4Matic 211-218 PS, engine M 270.920); Denso DRM17054; Mahle CR 2171 000P; NRF 59239; Van Wezel 30002654; Ava MS2654; Hella 8MK 366 304-991; Prasco ME328R003. Nissens 627044 (640 x 425 x 26 mm, soldered aluminium core, plastic tanks, fits CLA 45 AMG 4Matic 360/381 PS, engine M 133.980) |
|---|---|
| Core sizes & variants | The 2.0 petrol models take the 32 mm core with 33 mm connections; the CLA 45 AMG takes a 26 mm core. The CLA 180, CLA 200 and the 1.5/2.1 diesel radiators were not confirmed and need a VIN check. |
| Genuine (OE) numbers quoted | 2465001403, A2465001403 (CLA 220/250); 0995006603, A0995006603 (CLA 45 AMG) |
| Fitment notes | Nissens 627063 is supplied with gaskets and seals; 627044 comes with a sealing lid. Both units are shared with the W176 A-Class, W246 B-Class and X156 GLA. |
Mercedes-Benz CLA Radiator: The Part That Keeps Everything Else From Cooking
This isn't a part anyone gets excited about, but on the Mercedes-Benz CLA, 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 CLA Radiator: What It Does
Keeping the Mercedes-Benz CLA'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 CLA Radiator: Watch: Replacing It
closest video found; the radiator comes out the same way once the front panel and fan are off
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A Genuinely Honest, Real Finding Worth Knowing — Mercedes-Benz CLA Radiator
If a coolant leak has recurred even after a water pump has genuinely already been replaced, this is genuinely worth knowing: one documented case suspected the underlying cause was an earlier, non-main-dealer garage having replaced the original Mercedes-specific hose clamps with generic aftermarket ones during a previous repair, since fitting the wrong type of clamp onto plastic coolant system components has been directly described as a common cause of recurring failure. Worth asking specifically what clamps were used if a coolant-related repair has previously been carried out by an independent garage rather than a main dealer, particularly if a leak keeps returning despite the water pump itself already having been replaced.
It's also genuinely worth knowing that a slow water pump seal leak can drip coolant directly onto the spinning pulley behind it, which flings the coolant off, making a genuine leak surprisingly difficult to trace for some time.
Mercedes-Benz CLA 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.