Mercedes-Benz GLB 2023 Operator's Manual page 420

418 Display messages and warning/indicator lamps
Warning/indicator lamp Possible causes/consequences and
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If the coolant temperature display is at the lower end of the temperature scale:
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If the coolant temperature display is at the upper end of the temperature scale:
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* The yellow coolant warning lamp is lit while the engine is running.
Possible causes are:
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Coolant warning lamp (yel-
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low)
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Solutions
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Note the messages on the instrument display.
Consult a qualified specialist workshop.
Exit the vehicle and keep a safe distance from it until the engine has cooled down.
Check the coolant level ( page 287).
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Make sure that the air supply to the radiator is not obstructed.
Avoiding high loads on the engine, drive to the nearest qualified specialist workshop. In doing so, ensure that the
coolant temperature display remains below the red area.
The temperature sensor is malfunctioning
The charge air, transmission oil or battery cooling is faulty
The radiator shutters are blocked or defective
Avoiding high loads on the engine, drive to the nearest qualified specialist workshop.