Mercedes-Benz SLR-Class 2009 - Manual (Page 255)

255
Operation
Engine compartment
Coolant
The engine coolant is a mixture of water
and anticorrosion/antifreeze.
When checking coolant level,
ț the vehicle must be parked on level
ground
ț the coolant temperature must be be-
low 158°F (70°C)
1 Expansion tank
̈ Using a rag, turn cap slowly approxi-
mately one half turn to the left to
release any excess pressure.
̈ Continue turning the cap to the left and
remove it.
The coolant level is correct if the level
ț for cold coolant: reaches the upper
mark on the bracing rib of the ex-
pansion tank (arrow)
ț for warm coolant: is approximately
0.4 in (1 cm) higher
̈ Add coolant as required.
̈ Replace and tighten cap.
For more information, see “Coolants”
(
୴ page 398).
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
approximately
1 /
2
turn to relieve excess
pressure. If opened immediately, scald-
ing hot fluid and steam will be blown out
under pressure.
ț Do not spill antifreeze on hot engine
parts. Antifreeze contains ethylene
glycol which may burn if it comes into
contact with hot engine parts.