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Possible causes/consequences and MM Solutions
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Connect a suitable charger approved by Mercedes-Benz with sufficient charge output to the jump-start connec‐
tion point of the 12 V battery (→ page 371).
The 48 V battery is charged via the voltage converter in the vehicle.
Engine Can Now Be Started
*The 48 V battery has been charged automatically via the voltage converter.
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Start the engine and drive the vehicle for a while to charge the 12 V battery and the 48 V battery.
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*The fan motor is defective.
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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 marking.
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Coolant Too Hot Stop Vehi-
cle Turn Engine Off
*The coolant is too hot.
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Pull over and stop the vehicle safely and switch off the engine, paying attention to road and traffic conditions.
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WARNING Danger of burns when opening the hood
If you open the hood when the engine has overheated or during a fire in the engine compartment, you could
come into contact with hot gases or other escaping 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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Wait until the engine has cooled down.
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Make sure that the air supply to the radiator is not obstructed.
Display messages and warning/indicator lamps
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