Mercedes-Benz GLB 2023 Operator's Manual page 419

Engine
Warning/indicator lamp Possible causes/consequences and
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* The red coolant warning lamp is lit while the engine is running.
Possible causes are:
R
Coolant warning lamp (red)
R
R
R
R
If there is an additional warning tone, the coolant temperature has exceeded the maximum permissible temperature.
#
M
The temperature sensor is malfunctioning
The coolant level is too low
The air supply to the radiator is obstructed
The radiator fan is faulty
The engine coolant pump is faulty
& WARNING Risk of burns when opening the hood
If you open the hood in the event of an overheated engine or fire in the engine compartment, the following situations
may occur:
You may come into contact with hot gases.
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You may come into contact with other escaping hot operating fluids.
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Before opening the hood, allow the engine to cool down.
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In the event of a fire in the engine compartment, keep the hood closed and call the fire service.
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Stop immediately in accordance with the traffic conditions and switch off the vehicle. Do not continue driving.
Display messages and warning/indicator lamps 417
Solutions