Mercedes-Benz 2009 CL-Class Operator's Manual page 516

Practical hints
Vehicle status messages in the multifunction display
Display messages
Coolant Low
Stop Vehicle
Turn Engine Off
G Warning!
Driving when your engine is overheated can cause some fluids which may have leaked into the engine compartment to catch fire. You could
be seriously burned.
Steam from an overheated engine can cause serious burns which can occur just by opening the engine hood. Stay away from the engine if
you see or hear steam coming from it.
Stop the vehicle in a safe location away from other traffic. Turn off the engine, get out of the vehicle and do not stand near the vehicle until
the engine has cooled down.
! The engine should not be operated with the coolant temperature above 248‡ (120†). Doing so may cause serious damage which is not
covered by the Mercedes-Benz Limited Warranty.
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Possible cause/consequence
The coolant is too hot.
Possible solution
X
Stop the vehicle immediately as soon as it is
safe to do so.
X
Turn off the engine immediately.
X
Engage the electronic parking brake.
X
Only start the engine again after the message
disappears. You could otherwise damage the
engine.
X
Observe the coolant temperature gauge in the
instrument cluster.
During severe operation conditions and stop-
and-go city traffic, the coolant temperature may
rise close to 248‡ (120†).