Mercedes-Benz S-Class Saloon 2021 Owner's Manual page 571

568 Display messages and warning/indicator lamps
568
Engine Engine
W W ar arning/indicat ning/indicator lamp or lamp
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Coolant warning lamp (red)
Possible causes/conseq P ossible causes/consequences and uences and
* The red coolant warning lamp is lit while the engine is running.
Possible causes:
The temperature sensor is malfunctioning
R
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.
& W W ARNING
ARNING Risk of burns when opening the bonnet
If you open the bonnet in the event of an overheated engine or re in the engine compartment, the following situa-
tions may occur:
You may come into contact with hot gases.
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You may come into contact with other escaping hot operating uids.
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Before opening the bonnet, allow the engine to cool down.
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In the event of a re in the engine compartment, keep the bonnet closed and call the re service.
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Stop immediately in accordance with the tra c conditions and switch o the vehicle. Do not continue driving.
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