Posted on 1/30/2026
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Coolant leaks on Mercedes vehicles can be frustrating because they don’t always leave a big puddle. A lot of them start as a slow seep that burns off on a warm engine, or a leak that only shows up after a long drive. The result is usually the same: the coolant level keeps dropping, the heater output gets inconsistent, or you start noticing a sweet smell after shutting the car off. Catching the leak early is worth it because modern cooling systems don’t tolerate low coolant for long. Why Mercedes Coolant Leaks Can Be Hard To Spot Mercedes engines run hot and are tightly packaged under the hood. That means small leaks can evaporate before they ever reach the ground. Plastic cooling components also age with heat cycles, and once they start to weaken, they can crack or warp in ways that leak only under pressure. Many Mercedes models also use multiple coolant hoses and quick-connect fittings. Those connectors are convenient, but after years of heat and vibra ... read more