Mercedes-Benz CLS-Class 2008 Owners Manual - Manual (Page 291)

290
Operation
Engine compartment
Coolant level
The engine coolant is a mixture of water
and anticorrosion/antifreeze.
When checking the coolant level,
ț the vehicle must be parked on level
ground
ț the coolant temperature must be
below 158°F (70°C)
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
̈ Using a rag, turn cap 2 slowly approx-
imately one half turn counterclockwise
to release any excess pressure.
̈ Continue turning cap 2 counterclock-
wise and remove it.
The coolant level is correct if the level:
ț for cold coolant: reaches marking
bar
1 in expansion tank 3
ț for warm coolant: is approximately
0.6 in (1.5 cm) higher
̈ Add coolant as required.
̈ Replace and tighten cap 2.
For more information on coolant, see the
“Technical data” section (
୴ page 452).
Warning!
G
In order to avoid potentially serious burns:
ț 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.
ț 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.
ț 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.
ț 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.