Mercedes-Benz GLC 2017 Operator's Manual page 305

Where possible, let the engine cool down and
touch only the components described in the
following.
G
WARNING
The engine compartment contains moving
components. Certain components, such as
the radiator fan, may continue to run or start
again suddenly when the ignition is off. There
is a risk of injury.
If you need to do any work inside the engine
compartment:
switch off the ignition
R
never reach into the area where there is a
R
risk of danger from moving components,
such as the fan rotation area
remove jewelry and watches
R
keep items of clothing and hair, for exam-
R
ple, away from moving parts
G
WARNING
The cooling system is pressurized, particularly
when the motor is warm. If you open the cap,
you could be scalded if hot coolant sprays out.
There is a risk of injury.
Let the engine cool down before you open the
cap. Wear gloves and eye protection. Slowly
open the cap to relieve pressure.
G
WARNING
Opening the hood when the engine is over-
heated or when there is a fire in the engine
compartment could expose you to hot gases
or other service products. There is a risk of
injury.
Let an overheated engine cool down before
opening the hood. If there is a fire in the
engine compartment, keep the hood closed
and contact the fire department.
Engine compartment
Checking coolant level
Checking the coolant level (example)
Park the vehicle on a level surface.
X
Only check the coolant level when the vehicle
is on a level surface and the engine has cooled
down.
Turn the SmartKey to position 2 in the igni-
X
tion lock ( page 127).
Y
or
Press the Start/Stop button twice on vehicles
X
with KEYLESS-GO or the KEYLESS-GO start
function ( page 128).
Y
Check the coolant temperature display in the
X
instrument cluster (
The coolant temperature must be below
158 ‡ (70 †).
Turn the SmartKey to position g in the igni-
X
tion lock ( page 127).
Y
or
Press the Start/Stop button once on vehicles
X
with KEYLESS-GO or the KEYLESS-GO start
function ( page 128).
Y
Slowly turn cap : half a turn counter-clock-
X
wise and allow excess pressure to escape.
Turn cap : further counter-clockwise and
X
remove it.
If the coolant is at the level of marker bar =
in the filler neck when cold, there is enough
coolant in coolant expansion tank ;.
If the coolant level is approximately 0.6 in
(1.5 cm) above marker bar = in the filler neck
when warm, there is enough coolant in expan-
sion tank ;.
If necessary, add coolant that has been tested
X
and approved by Mercedes-Benz.
Replace cap : and turn it clockwise as far as
X
it will go.
For further information on coolant, see
( page 362).
Y
page 35).
Y
Z
303