Mercedes-Benz S-Sedan 2015 Owners Manual - Manual (Page 317)

Warning/
indicator
lamp
N N Signal type
Possible causes/consequences and M
M Solutions
? N The red coolant warning lamp lights up while the engine is running and the
coolant temperature gage is at the start of the bar display.
The temperature sensor for the coolant temperature gage is defective.
The coolant temperature is no longer being monitored. There is a risk of engine
damage if the coolant temperature is too high.
X Pull over and stop the vehicle safely and switch off the engine, paying
attention to road and traffic conditions. Do not continue driving under any
circumstances.
X
Secure the vehicle against rolling away (
Y
page 192).
X
Consult a qualified specialist workshop.
Warning and indicator lamps in the instrument cluster
315
On-bo
ard
computer
and
displays
Z