Mercedes-Benz 2007 CLS 550, Operator'S Manual

Page: 291 / 481

290
Operation
Engine compartment
Coolant level
The engine coolant is a mixture of water
and anticorrosion/antifreeze. To check
the coolant level, the vehicle must be
parked on level ground and the engine
must be cool.
The coolant expansion tank is located on
the driver’s side of the engine compart-
ment.
1
Marking bar in the expansion tank
2
Cap
3
Coolant expansion tank
왘
Using a rag, turn cap
2
slowly approx-
imately one half turn counterclockwise
to release any excess pressure.
왘
Continue turning the cap
2
counter-
clockwise and remove it.
The coolant level is correct if the level:
앫
for cold coolant: reaches marking
bar
1
in the expansion tank
3
앫
for warm coolant: is approximately
0.6 in (1.5 cm) higher
왘
Add coolant as required.
왘
Replace and tighten cap
2
.
For more information on coolant, see the
“Technical data” section (
컄
page 453).
Warning!
G
In order to avoid potentially serious burns:
앫
Use extreme caution when opening the
hood if there are any signs of steam or
coolant leaking from the cooling system,
or if the coolant temperature gauge indi-
cates that the coolant is overheated.
앫
Do not remove pressure cap on coolant
reservoir if coolant temperature is
above 158°F (70°C). Allow engine to
cool down before removing cap. The
coolant reservoir contains hot fluid and
is under pressure.
앫
Using a rag, slowly open the cap approx-
imately
1
/
2
turn to relieve excess pres-
sure. If opened immediately, scalding
hot fluid and steam will be blown out
under pressure.
앫
Do not spill antifreeze on hot engine
parts. Antifreeze contains ethylene gly-
col which may burn if it comes into con-
tact with hot engine parts.