Mercedes-Benz C-Class Coupe Operator's Manual page 244

Warning and indicator lamps in the instrument cluster
242
Problem
?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gauge is at the
start of the scale.
Possible causes/consequences and M M Solutions
The temperature sensor for the coolant temperature gage is defec-
tive.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
Pull over and stop the vehicle safely and switch off the engine,
X
paying attention to road and traffic conditions. Do not continue
driving under any circumstances.
Secure the vehicle against rolling away (
X
Consult a qualified specialist workshop.
X
page 151).
Y