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Coolant levels full but warning light says low - thoughts?

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Old May 5, 2024 | 03:51 PM
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Coolant levels full but warning light says low - thoughts?
Coolant levels visually full but warning light says low - thoughts?

Runs at 190/200*.

Bad sensor? Easy swap?

Thanks.
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Old May 5, 2024 | 08:42 PM
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Sensor or reservoir, start with sensor but it's likely the reservoir.
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Old May 5, 2024 | 10:08 PM
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Originally Posted by VII
Sensor or reservoir, start with sensor but it's likely the reservoir.
Reservoir as in leak? Visually both are at full level.

With two reservoirs, one is for turbos and one the motor? I should know this.

Thanks
Last edited by Donnymac; May 5, 2024 at 10:11 PM.
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Old May 5, 2024 | 10:10 PM
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The reservoir contains the answer to how that sensor that does not get wet can tell the level.
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Old May 5, 2024 | 10:16 PM
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Originally Posted by VII
The reservoir contains the answer to how that sensor that does not get wet can tell the level.
Got it.

Hope you survived all the rain and ducked the twisters.
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Old May 6, 2024 | 10:44 PM
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Thanks, luckily it has not been too bad over here but the season is still young.
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Old May 6, 2024 | 11:38 PM
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Had this issue and my reservoir had a slight leak. Replaced and the message is gone. Also, be sure to check your intercooler reservoir (in the middle under the engine cover) once in a while... recently learned that there is not a sensor for that tank.
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Old May 7, 2024 | 12:01 AM
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Originally Posted by S550e
Had this issue and my reservoir had a slight leak. Replaced and the message is gone. Also, be sure to check your intercooler reservoir (in the middle under the engine cover) once in a while... recently learned that there is not a sensor for that tank.
Thank you sir. Will check mañana.
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Old Sep 1, 2024 | 07:13 PM
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I have this issues as well, the coolant level warning lights on after 65km city drive, the engine oil temperature is around 98, i don't know why, is the mecedes quality like that
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Old Sep 2, 2024 | 12:21 AM
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There are 2 coolant tanks. I intentionally slightly overfilled and no more warnings.

other option is failing sensor. Mine never overheated or put water on the garage floor.

I also cleaned both pressure caps/necks.

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Old Sep 2, 2024 | 01:16 AM
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The other part of the sensor is in the tank, for recurring issues change the tank.
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Old Sep 2, 2024 | 03:30 AM
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anyone can share some pics to indicate how to take the coolant sensor off?
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Old Sep 4, 2024 | 11:30 AM
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The disconnect is right there on top but the actual sensor is in the tank
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