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218
Checking and refilling levels
tion. The damage caused by the use of these anti-freezes may lead to a loss
of liquid coolant, causing serious damage to the engine.
•
The anti-freeze G12++ can be mixed only with anti-freeze additives G11,
G12 and G12+.
Checking the liquid coolant level
The liquid coolant level can be checked at a glance.
– Switch the ignition off.
– Check the coolant level on liquid coolant expansion tank
⇒ fig.
167. When the engine is cold, it should be between the
"min" and "max" marks. When the engine is hot, it may be
slightly above the "max" mark.
Its location is shown in the corresponding general overview of the engine
compartment.
The liquid coolant level should be checked with the engine switched off.
The liquid coolant level is monitored by a warning lamp in the instrument
panel ⇒ page 77. However, we recommend that it should be checked occa-
sionally.
Liquid coolant losses
Any loss of liquid coolant normally indicates a leak in the cooling system. In
this case the cooling system should be inspected by a specialist garage
without delay. It is not sufficient merely to top up the liquid coolant.
If there are no leaks in the system, a loss of liquid coolant can only occur if
the coolant boils and is forced out of the system as a result of overheating.
Caution
Radiator sealants must not be added to the liquid coolant. Such additives
could seriously impair the function of the cooling system.
Topping up the liquid coolant
Fig. 167 Engine compart-
Be careful when topping up with liquid coolant.
ment: Liquid coolant
deposit
– Switch the engine off.
– Wait for the engine to cool down.
– Cover the cap on the expansion tank
carefully unscrew the cap anti-clockwise ⇒
– Add liquid coolant.
– Screw on the cap tightly.
⇒ fig. 167
with a cloth, and
.
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