Checking and refilling levels
286
•
When the electric drive system is hot, its
cooling system is under pressure. Do not
open the expansion tank cap, hot coolant
may splash out and cause severe burns and
other injuries.
•
Turn the cap slowly and very carefully an-
ticlockwise while pressing it down slightly.
•
Always protect your face, hands and arms
from the hot coolant and steam with a
large thick cloth.
NOTICE
Only use distilled water! Other types of wa-
ter contain chemical substances that could
cause significant corrosion damage. If you
have added non-distilled water, have all of
the drive system’s coolant changed immedi-
ately by a specialist workshop.
•
When topping up the, do not fill over the
upper edge of the marked area
.
Otherwise, when the temperature rises the
excess fluid will be expelled from the motor
cooling system and could cause damage.
•
If the system leaks a lot of coolant, only
refill once the drive system has
cooled down
completely
. If there is a significant loss of
coolant, there may be leaks in the cooling
system. Immediately go to a specialist work-
shop to have the system checked. This could
damage the drive system!
•
Do not add coolant if the expansion tank
is completely empty! Air may have got into
the cooling system. Do not continue driving
and seek assistance from specialist person-
nel. This could damage the drive system!
•
When changing the operating fluids, make
sure that you pour the correct fluids into the
correct filler necks. Using the wrong operat-
ing fluids can lead to serious malfunctions
and damage to the electric drive system.
Troubleshooting
Motor coolant
The warning lamp flashes red.
The motor coolant temperature is too high or
the motor coolant level is too low.
•
Stop driving!
Stop the vehicle at the next
opportunity and in a safe place.
•
Switch off the drive system.
•
Wait for the electric drive system to cool
down.
•
Check the coolant level in the coolant ex-
pansion tank
If the warning lamp does not go out even
though the motor coolant level is correct, do
not continue to drive or leave the motor run-
ning.
•
Seek specialist assistance.
together with
: Failure in the cool-
ing system of the high-voltage system
The warning lamps flash red.
Stop the vehicle immediately!
•
Switch off the drive system.
•
Seek specialist assistance.
Brake fluid
Check and refill the brake fluid
Fig. 193
Front compartment: brake fluid
reservoir cap.
Checking the brake fluid level
The brake fluid level must be between the
and
markings.
However, if the brake fluid level goes down no-
ticeably in a short time, or drops below the
mark, there may be a leak in the brake sys-
