Mercedes-Benz 2011 GLK-Class Operator's Manual page 237

coolant reservoir contains hot fluid and is
under pressure.
using a rag, slowly turn the cap
R
1
approximately /
2
pressure. If opened immediately, scalding
hot fluid and steam will be blown out under
pressure.
do not spill antifreeze on hot engine parts.
R
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts.
X
Slowly turn cap : half a turn counter-
clockwise and allow excess pressure to
escape.
X
Turn cap : further counter-clockwise and
remove it.
If the coolant is at the level of marker bar
= in the filler neck when cold, there is
enough coolant in coolant expansion
tank ;.
If the coolant is approximately 0.6 in
(1.5 cm) higher when warm, there is
enough coolant in coolant expansion
tank ;.
X
If necessary, add coolant which has been
tested and approved by Mercedes-Benz.
X
Replace cap : and turn it clockwise as far
as it will go.
For further information on coolant, see
( Y page 298).
turn to relieve excess
Engine compartment
Windshield washer system/headlamp
cleaning system
The washer fluid reservoir is used for both the
windshield washer system and the headlamp
cleaning system.
G
Warning
Washer solvent/antifreeze is highly
flammable. Do not spill washer solvent/
antifreeze on hot engine parts, because it may
ignite and burn. You could be seriously
burned.
! At temperatures below freezing, always
fill the washer fluid container with a mix of
windshield washer concentrate and
antifreeze additive. There is otherwise a
risk of damaging the windshield washer
system/headlamp cleaning system.
! Only use washer fluid concentrate which
is suitable for plastic lenses. Unsuitable
washer fluid concentrate could damage the
plastic lenses of the headlamps.
! Do not add distilled or de-ionized water to
the washer fluid container. Otherwise, the
fluid level measuring gauge could be
damaged.
i Add windshield washer concentrate, e.g.
MB SummerFit, to the washer fluid all year
round.
Example: washer fluid reservoir
235
Z