Mercedes-Benz GLE Coupe 2023 Operator's Manual page 465

Warning/indicator lamp Possible causes/consequences and
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Engine
Warning/indicator lamp Possible causes/consequences and
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* After a cold start, the blue engine operating temperature warning lamp is on.
Engine output and engine torque are reduced.
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Engine operating tempera-
ture warning lamp
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* The red coolant warning lamp is lit while the engine is running.
Possible causes are:
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Coolant warning lamp (red)
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R
Solutions
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Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do not
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continue driving under any circumstances.
Consult a qualified specialist workshop.
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Note the messages on the driver's display.
Solutions
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Take this into consideration in your driving style.
The temperature sensor is malfunctioning
The coolant level is too low
The air supply to the radiator is obstructed
Display messages and warning/indicator lamps 463