Mercedes-Benz CLS Radiator Fan Replacement Parts

The CLS uses an electric radiator fan (also called a cooling fan or fan module) rather than a mechanical belt-driven fan, so the part does exist on this model across all generations. The electric fan assembly sits in front of the radiator and is controlled by the ECU based on coolant temperature and AC demand. When searching, you may also see it listed as a fan cowl assembly or fan module, which typically includes the motor, shroud, and blades as one unit.

No — the W219 (2004–2010) and C257 (2018–2023) are completely different generations with different bodyshells, engine families, and cooling system layouts, so the fan assemblies are not interchangeable. The W219 was the first-generation CLS and the C257 the third, with entirely different underpinnings between them. Always quote the generation or registration to your breaker so they pull the correct fan module.

The W218 ran from 2011 to 2018, with a facelift arriving in 2014, and on the same engine code the fan unit is often the same part — but mounting bracket arrangements and wiring connector designs can change mid-production. Because ancillary fitment changes like these are difficult to confirm without checking your specific registration, we recommend confirming compatibility against your reg with the breaker before buying. Giving the breaker your engine code (found on your V5 or a VIN check) is the single most reliable way to get the right unit.

Yes — engine code is the most important factor for fan fitment on the CLS, because the fan motor rating, connector type, and bracket configuration can differ between petrol and diesel variants and between different engine families (for example a 3.0 V6 diesel versus a 5.5 V8 petrol will not share the same fan assembly). Always supply your engine code, which you can find on your V5C logbook or by running a VIN check, when asking breakers for a quote. Fuel type alone is a useful starting point, but the full engine code is what the breaker needs to be certain.

It can matter, because AMG variants of the CLS — such as the CLS 63 AMG in the W218 generation — use different engine families from standard models, and the cooling demands and fan specifications differ accordingly. However, trim level in the cosmetic sense (for example, AMG Line styling packs on a standard diesel) does not affect fan fitment at all. Give your breaker the full engine code rather than just the badge name, as this removes any ambiguity between a true AMG powertrain and an AMG-badged standard engine variant.

Almost certainly not on a direct swap, because the 250, 350, and 500 badges indicate different engine codes with different cooling requirements, and the fan modules are typically matched to a specific engine family and its power output. The 350 designation in particular has covered both petrol and diesel engines across different generations, so the badge alone is not enough information to confirm compatibility. Share your engine code with the breaker — it is the quickest way to confirm whether a unit from a different-badged CLS will physically and electrically match yours.