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Mysterious Coolant Loss in 2020 E450 - Where is it Going?

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Mike T. · rep 0 · May 25, 3:08 AM · 1 replies · solved · Question

Vehicle: 2020 Mercedes-Benz E450 (W213)

I've been noticing a drop in the coolant level in my 2020 Mercedes-Benz E450 (W213) over the past few weeks. I topped it up once, but the "Low Coolant" warning light came back on a few days later. I don't see any obvious puddles under the car, but I can sometimes smell a faint sweet odor, especially after driving.

The engine temperature gauge seems normal, and there's no smoke from the exhaust. Could this be a common leak point for this model? What should I be looking for, and is it safe to drive short distances until I can get it checked out?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:08 AM

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ClearTheCode admin answer:

A persistent coolant loss with a sweet odor, even without visible puddles, is a clear indication of a leak in your 2020 Mercedes-Benz E450 (W213). While the temperature gauge reads normal now, a significant loss of coolant can quickly lead to overheating and severe engine damage, so this needs to be addressed promptly.

Here are common areas to inspect and potential causes:

  1. Water Pump: The water pump is a frequent culprit for leaks, especially as vehicles age. Look for crusty coolant residue or drips around the pump housing, often located at the front of the engine.
  2. Thermostat Housing: The housing where the thermostat is located can develop cracks or have failing gaskets, leading to slow, hard-to-spot leaks.
  3. Hoses and Clamps: Inspect all coolant hoses (radiator, heater, bypass) for swelling, cracking, or signs of seepage around the clamps. Mercedes-Benz uses various plastic and rubber components that can degrade over time.
  4. Radiator: Small cracks in the radiator fins or end tanks can cause leaks that evaporate quickly, leaving no puddle. Look for discoloration or residue on the radiator itself.
  5. Expansion Tank (Reservoir): The plastic coolant reservoir can develop hairline cracks, especially around seams or where hoses connect.
  6. Heater Core: If you notice a sweet smell inside the cabin, or a film on the inside of your windshield, it could indicate a leaking heater core.
  7. Head Gasket (Less Common): While less likely without other symptoms like white smoke from the exhaust, oil in the coolant, or coolant in the oil, a failing head gasket can cause internal coolant loss.

When to See a Shop:

  • Pressure Test: The most effective way to find an elusive coolant leak is a cooling system pressure test. A professional shop can pressurize the system and visually locate the leak, even if it's slow or only leaks under pressure.
  • UV Dye: Sometimes, a UV dye can be added to the coolant to help pinpoint the exact source of the leak under a black light.
  • Do Not Delay: Driving with low coolant is risky. While short distances might be okay if you monitor the temperature, it's best to have it inspected by a Mercedes-Benz specialist immediately to prevent potential engine damage. There are no specific OBD codes for a coolant leak itself, but codes like P0117/P0118 (ECT sensor) or P0128 (thermostat) might appear if the leak affects temperature regulation.
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