Checking and topping up fluids
Coolant additive
The coolant additive contains anti-freeze and cor
rosion protection agent. Only use one of the
fol
lowing coolant additives. It is possible to mix
these additives.
Topping up coolant
Coolant additive
G13
G12++
Specification
TL774J
TL 774
G
The amount of coolant additive which needs to
be mixed with the water depends on the temper
atures to be expected in the winter season. If the
anti-freeze concentration is too Low, the coolant
can freeze and cause engine damage.
Hot regions
Cold regions
Coolant
additive
min.
40%
max. 45 %
min.
50%
max. 55 %
Frost protec
tion
min.-25°C
max. -40 °C
(T)
CAUTION
- Have your qualified workshop check the
cooling system before the winter season to
make sure that the anti-freeze concentra
tion is adequate for the conditions to be ex
pected.
This applies particularly if
you
drive
into a colder climate zone.
- To prevent damage to the engine, do not
use a different type of anti-freeze additive if
the approved type of additive is not availa
ble.
In this case use only water and bring
the coolant concentration back up to the
correct level as soon as possible by putting
in the specified additive.
- Always top up with fresh, unused coolant.
- Radiator sealants must not be added to the
coolant.
Fig.
248 Engine compartment: Markings on coolant ex
pansion tank
Please refer to the safety notes
^page
295,
Working on components in the engine compart
ment.
Checking coolant level
•
Park the vehicle on a level surface.
•
Switch off the ignition.
•
Read off the coolant level on the coolant ex
pansion tank
^>Fig.
248. When the engine is
cold,
the coolant level should be between the
marks. When the engine is warm, it may be
slightly above the top mark.
Topping up coolant
Important: The coolant expansion tank must not
be empty
•=>([).
•
Wait for the engine to cool down.
•
Cover the cap on the expansion tank with a
cloth,
and carefully unscrew the cap
anti-clock
wise
<=>
/K.
*-
Add coolant in the correct concentration
tapage
299 up to the top mark.
•
You should make sure that the fluid level re
mains stable. If necessary, add more coolant.
•
Screw the cap on again tightly.
Any loss of coolant normally indicates a Leak in
the cooling system. Drive to a qualified workshop
without delay and have the cooling system
checked.
If there are no leaks in the system, a
loss of coolant can only occur if the coolant boils
and is forced out of the system as a result of
overheating.
300
