Mercedes-Benz E-Class Radiator: Specs, Fitment & Common Faults
A genuinely distinctive finding: a slow water pump seal leak can drip coolant onto the spinning pulley, which flings it off and makes the leak essentially disappear rather than pooling anywhere obvious — worth checking behind the pulley if a slow coolant loss can't otherwise be explained.
Illustration for editorial purposes
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Mercedes-Benz E-Class Radiator: OEM Part Number
| Manual gearbox (older/entry variants, where fitted) | No dedicated transmission cooling circuit required |
|---|---|
| 7G-Tronic/9G-Tronic automatic, standard engines | A separate, standalone transmission oil cooler is fitted ahead of the main radiator and air conditioning condenser — confirmed as a genuinely distinct component from the radiator itself, not a tank integrated into it |
| AMG/higher-output engines | Larger-capacity cooling package overall, including a bigger dedicated transmission cooler to cope with the increased heat generated by the more powerful engine and harder-working transmission |
| 4MATIC (four-wheel drive) variants | The transfer case shares the same transmission fluid, adding an additional heat load compared to rear-wheel-drive variants |
Mercedes-Benz E-Class Radiator: The Part That Keeps Everything Else From Cooking
Nothing about this component is glamorous, but on the Mercedes-Benz E-Class, almost every serious engine failure that isn't wear-related traces back to a cooling system problem left unaddressed. Catching the early signs here is genuinely cheap insurance against a much bigger bill.
Mercedes-Benz E-Class Radiator: What It Does
The Mercedes-Benz E-Class's radiator transfers heat from the engine coolant to the surrounding air, keeping engine temperature within a safe operating range. On automatic versions, it often also cools transmission fluid through a separate internal circuit — one more reason the correct part number matters so much here.
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A Genuinely Distinctive, Useful Finding Worth Knowing — Mercedes-Benz E-Class Radiator
If a coolant level keeps dropping slowly with no obvious puddle or visible leak anywhere underneath the car, this is genuinely worth knowing: a slow water pump seal leak can drip coolant directly onto the spinning pulley behind it, which then flings the coolant off as it rotates, causing it to essentially disappear rather than pooling anywhere obvious. This can make a genuine, ongoing leak surprisingly difficult to trace for some time, sometimes only becoming an obvious, large leak once the seal eventually fails more completely — worth having the area behind the pulley specifically inspected with a torch and mirror if a slow coolant loss can't otherwise be explained.
It's also genuinely worth knowing that a water pump and thermostat housing failing together has been documented on genuinely young, low-mileage cars, with Mercedes-Benz UK having granted a goodwill discount specifically on the water pump element in at least one case, worth asking about this if facing a similar early failure.
Mercedes-Benz E-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.