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Practical hints
What to do if ...
Display symbol Display message
D
±
Display Malfunction
Service Required
Engine
Service
378
Possible cause/consequence Possible solution
The cooling fan for the coolant is
malfunctioning.
Certain electronic systems are
unable to relay information to
the control system. The follow-
ing systems may have failed:
Coolant temperature display
Tachometer
Cruise control display
There may be a malfunction in:
the fuel injection system
the ignition system
the exhaust system
Observe the coolant temperature indicator in the
instrument cluster ( page 26).
If the coolant temperature is under 248°F (120°C),
you may continue driving to an authorized
Mercedes-Benz Center.
Avoid placing heavy loads on the engine (e.g. by
driving uphill) as well as stop-and-go traffic.
Have the fan replaced as soon as possible.
Have the electronic systems checked by an autho-
rized Mercedes-Benz Center.
Have the engine checked as soon as possible by an
authorized Mercedes-Benz Center.
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