Why does the Mercedes-Benz E-Class leak coolant?

[VanMicah]

Mercedes-Benz E-Class coolant leakage reasons: Cooling system sealing issues: Loose seals at the connections between the coolant reservoir and radiator in the cooling system can cause coolant leakage. Hose problems: Many hoses are made of rubber material. After prolonged use, hoses inevitably age and develop cracks. Cracked hoses will lead to coolant leakage. Another possibility is leakage at hose connections - repeated disassembly of hoses can cause wear, or if not properly tightened during installation, both scenarios may result in fluid leakage. Radiator issues: Corrosion in the radiator can also cause coolant to leak out.

[McWilliam]

I've driven a Mercedes-Benz E-Class for over a decade, and coolant leakage is a common issue. It's mainly caused by aging or damaged components in the cooling system. For example, the sealing rings at the hose connections often crack and leak due to prolonged exposure to high temperatures. If the radiator itself has cracks or loose connections, coolant can slowly seep out. Another common culprit is the water pump—when its seals wear out, coolant leaks from the rotating shaft and spills onto the ground when the car moves. More seriously, if the engine cylinder head gasket fails, coolant mixes with the engine oil, and without prompt repair, it can lead to engine seizure. Always pay attention to the engine temperature warning light while driving, and check the ground for colored liquid stains after parking. Regular maintenance and inspections of these parts are crucial—the Mercedes-Benz E-Class has intricate design details, so don’t take them lightly. Early detection and repair can save you from costly repairs down the road.

[JonathanRose]

My Mercedes-Benz E-Class had a coolant leak last year, which caused quite a headache. At first, I thought it was just low on coolant, but it turned out to be a leaking hose connection due to aging. During the repair, the mechanic mentioned that this model commonly has sealing component issues, such as plastic radiator joints prone to cracking, and once the water pump seal wears out, coolant will leak out. Another time, I found that a slight damage to the engine head gasket could also cause seepage. The mechanic advised owners to check for leaks by looking at the garage floor after parking overnight and to monitor the coolant level monthly. Don’t wait until the engine overheats and triggers a warning—that’s too risky. Repairs aren’t too expensive, but it’s important to find a reliable technician. In short, ignoring small issues can lead to bigger troubles, but with proper maintenance, the car will run smoothly.

[McAlex]

When driving a Mercedes-Benz E-Class, coolant leakage is mostly caused by faults in the cooling system components. Poor sealing or cracking of hose connections can easily lead to leaks, as can cracks in the radiator. A damaged water pump seal is a common issue, with coolant seeping from this point. Check these areas to see if the coolant level is dropping rapidly. After parking, pay attention to whether there are any green liquid traces on the ground, and don't overlook minor leaks. Addressing the issue early can prevent engine overheating damage.

[VonLola]

When maintaining my Mercedes-Benz E-Class, I always pay attention to the coolant issue, as leaks are usually caused by aging components. The sealing rings of the hose joints are prone to deterioration and leakage, while cracks in the radiator or wear of the water pump seals can also lead to leaks. Check for fluid traces on the ground after parking overnight in the garage, or inspect the fluid level when the engine is cold. A pressure test can reveal hidden leaks. Early maintenance saves money and hassle—simply replace the faulty parts to avoid engine overheating and major repairs. Long-term neglect can cause more severe damage.