Mercedes-Benz S-Class 2020 Owner's Manual page 569

566 Display messages and warning/indicator lamps
Engine
Warning/indicator lamp
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Coolant warning lamp (red)
Possible causes/consequences and
* The red coolant warning lamp is lit while the engine is running.
Possible causes:
The temperature sensor is malfunctioning
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The coolant level is too low
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The air supply to the radiator is obstructed
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The radiator fan is faulty
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The engine coolant pump is faulty
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If there is an additional warning tone, the coolant temperature has exceeded 120°C.
& WARNING Risk of burns when opening the bonnet
If you open the bonnet when the engine has overheated or when there is a fire in the engine compartment, the
following situations may occur:
You could come into contact with hot gases.
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You could come into contact with other hot, escaping operating fluids.
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Before opening the bonnet, allow the engine to cool down.
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In the event of a fire in the engine compartment, keep the bonnet closed and call the fire service.
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