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Maintenance
350
Observe the instructions on the respective
original container when using, storing and dis-
posing off service products. Always store ser-
vice products in the sealed original container.
Always keep service products out of the reach
of children.
! Do not operate the vehicle if the coolant
level is too low. Otherwise, the engine may
be damaged.
Example: coolant expansion tank
The coolant expansion tank may be under the
maintenance flap or behind the cab.
Vehicles with retarders are equipped with a
coolant pressure regulation system. The cool-
ant pressure regulation system regulates and
monitors the pressure in the engine cooling
system.
If the on-board computer shows the yellow
Coolant pressure regulation faulty
event window, check the electrical plug con-
nectors of plugs : and hose fitting ; for
correct seating. Hose fitting ; and turquoise
cap = must be free from leakage. If you
detect any leakage, have the engine cooling
system checked at a qualified specialist work-
shop.
If the coolant level in the coolant expansion
tank is too low, the on-board computer dis-
plays the yellow (
Y
page 175) or red
Y
(
page 191) event window with the *
symbol.
Only open the coolant expansion tank when
the coolant temperature is below 50 †.
The coolant level can only be accurately
determined when the coolant temperature is
between 0 † and 25 †. First check the cool-
ant temperature using the on-board com-
puter (
Y
page 160).
If you need to top up coolant, add corrosion
inhibitor/antifreeze additive as specified in
Sheet No 325.5 to the water, e.g. Glysantin
®
G40
. Pay attention to the coolant mixture
ratio and the water quality (
not mix the water and the antifreeze/anti-
corrosion additive in the coolant circuit, first
mix together then fill the coolant expansion
tank with the mixture.
X
Park the vehicle on a level surface.
X
Apply the parking brake.
X
Switch off the engine.
X
Switch the ignition lock to position 0.
X
Vehicles with coolant expansion tank under
the maintenance flap: open the mainte-
nance flap (
Y
page 349).
X
Vehicles with coolant expansion tank
behind the cab: slide cover ? open.
For vehicles with the coolant expansion
i
tank behind the cab, ensure a secure foot-
ing when refilling the coolant.
X
Turn turquoise cap = slowly anti-clock-
wise and release the pressure.
X
Unscrew and remove turquoise cap =.
X
Check coolant level.
The coolant in the expansion tank must
reach up to the edge of the filler neck.
X
Top coolant up to the edge of the filler neck.
X
Replace turquoise cap = and tighten it as
far as it will go.
®
Y
page 338). Do
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