Fig. 207 In the bonnet spa
ce: cap of the
coolant expansion tank.
WARNING
Escaping hot steam or coolant can cause
serious burns, a
s can hot engine parts.
·
Never open the bonnet if you can see or
hear steam or coolant coming out of
the bonnet space.
·
Always wait until you can no longer see
or hear steam or coolant coming from
the bonnet space.
WARNING
The cooling system is under pressure
when the engine is hot. If the c
over is
opened without due care, engine coolant
can spray out and cause severe burns or
fatal injuries.
·
Never open the cap of the coolant ex-
pansion tank when the engine is hot.
·
Always protect your face, hands and
arms from hot coolant or steam with
a large, thick cloth if you have to open
the cap of the coolant expansion tank.
·
Turn the cap of the coolant expansion
tank slowly and very carefully anti-
clockwise while exerting slight down-
wards pressure on the cap.
Checking the coolant level
Fig. 208 In the bonnet spa
ce: marking on
the coolant expansion tank (illustration).
The engine coolant may be above the
marked area when a new vehicle is deliv-
ered or aer repairs to the cooling system.
This is normal. The coolant does not have
to be extracted.
The coolant level cannot be checked accu-
rately in all models as visibility of the fluid
level in the coolant expansion tank may be
obstructed. If the coolant level cannot be
read exactly, contact a suitably qualified
workshop.
1. Check the coolant level at the side
markings of the coolant expansion tank
when the engine is cold → Fig. 208.
The coolant level must be between the
markings.
2. Add coolant if the fluid level in the cool-
ant expansion tank is below the mini-
mum marking “min”.
When the engine is warm, the engine
coolant level may be slightly above the
upper mark.
3. Do not add coolant if there is no longer
any coolant visible in the coolant ex-
pansion tank →
.
R
elling coolant
1. Unscrew the lid carefully →
.
2.
Only refill with new coolant that is com-
pliant with the specifications
→ page 337.
If in an emergency you do not have ac-
cess to coolant in the required specifi-
cation, add only distilled water initially.
Then have the correct mixture ratio with
the specified coolant additive restored
338
Checking and refilling