If the coolant level in the coolant expansion res‐
ervoir is too low, the on-board computer displays
the yellow (
/
page 129) or red (
/
page 145)
event window with the
+
symbol.
The coolant expansion reservoir can only be
opened at a coolant temperature of under 50 °C.
The correct coolant level can only be checked
when the coolant temperature is between 0 °C
and 25 °C. Check the coolant temperature on the
on-board computer beforehand.
If the coolant has to be topped up, add approved
corrosion inhibitor/antifreeze agent to the water
according to Sheet No. 325.5. Pay attention to
the coolant composition and the water quality .
Mix the water and the corrosion inhibitor/anti‐
freeze agent together externally of the coolant
circuit and then fill the mixture in the coolant
expansion reservoir.
#
Park the vehicle horizontally.
#
Apply the parking brake.
#
Switch off the engine.
#
Vehicles with coolant expansion reservoir
below the maintenance flap: open the mainte‐
nance flap (
/
page 321).
#
Vehicles with coolant expansion reservoir
behind the cab: slide the cover
4
open.
%
On vehicles with coolant expansion reservoir
behind the cab, make sure you have firm
footing when refilling coolant.
#
Slowly turn the turquoise cap
3
anti-clock‐
wise to relieve the excess pressure.
#
Continue turning the turquoise cap
3
and
remove it.
#
Check the coolant level.
The coolant in the coolant expansion reser‐
voir must reach to the edge of the filler neck.
#
Add coolant until it reaches the edge of the
filler neck.
#
Replace the turquoise cap
3
and tighten as
far as it will go.
#
Vehicles with coolant expansion reservoir
below the maintenance flap: close the main‐
tenance flap.
#
Vehicles with coolant expansion reservoir
behind the cab: slide the cover
4
shut.
Checking hydraulic fluid level of the clutch
operation system
*
NOTE Damage to the clutch operation
system caused by adding the wrong
hydraulic fluids
Never top up with hydraulic fluid of another
quality grade or brake fluid.
Otherwise the hydraulic clutch operation sys‐
tem can be damaged.
*
NOTE Damage to the clutch operation
system caused by the fluid level being
too low
If the fluid level in the expansion reservoir of
the hydraulic clutch operation system does
not reach the Min. marking, the hydraulic sys‐
tem might be leaking.
#
Have the hydraulic system checked at a
qualified specialist workshop.
For the hydraulic clutch operation system,
hydraulic fluid according to sheet no. 345.0 of
the Mercedes-Benz Specifications for Service
Products is mandatory.
The hydraulic fluid for the hydraulic clutch opera‐
tion system does not need to be renewed.
#
Open the maintenance flap (
/
page 321).
#
Check the fluid level at the expansion reser‐
voir.
The fluid level must be between the max.
1
and min.
2
markings.
#
Close the maintenance flap.
Maintenance and care
323
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