304 Practical hintsWhat to do if …?Symbol messagesDisplay symbol
Display messages
Possible cause
Possible solution
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BATTERY/ALTERNATOR
VISIT WORKSHOP!
The battery was charged with a battery 
charger or jump started.
Have the battery checked at a service 
station. 
The battery is no longer charging.
Possible causes:
alternator malfunctioning
broken poly-V-belt
Stop immediately and check the 
poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise the 
engine will overheat due to an inoperative 
water pump which may result in damage 
to the engine. Notify an authorized 
Mercedes-Benz Center.
If it is intact:
Drive immediately to the nearest autho-
rized Mercedes-Benz Center. Adjust driv-
ing to be consistent with reduced braking 
responsiveness. 
308 Practical hintsWhat to do if …?Display
Display messages
Possible cause
Possible solution
Ï 
COOLANT
STOP, ENGINE OFF!
The poly-V-belt could be broken.
Stop immediately and check the 
poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise the 
engine will overheat due to an inoperative 
water pump which may result in damage 
to the engine. Notify an authorized 
Mercedes-Benz Center.
If it is intact:
Do not continue to drive the vehicle with 
this message displayed. Doing so could 
result in serious engine damage that is 
not covered by the Mercedes-Benz Limit-
ed Warranty.
Ï 
COOLANT
VISIT WORKSHOP!
The cooling fan for the coolant is malfunc-
tioning.
Observe the coolant temperature display.
Have the fan replaced as soon as possi-
ble.