cooling system when the engine is hot and
could cause damage.
·
If a large amount of coolant has been lost,
do not refill the coolant until the engine
has
cooled completely
. Heavy coolant loss
is an indication of leaks in the cooling sys-
tem. The cooling system should be
checked by a qualified workshop as soon
as possible. Failure to do so can result in
engine damage.
·
Do not refill coolant if there is no more
coolant in the coolant expansion tank. Air
could have entered the cooling system. Do
not drive on! Seek expert assistance. Fail-
ure to do so can result in engine damage.
·
When refilling service fluids, please ensure
that you pour the correct service fluids in-
to the correct openings. The use of incor-
rect service fluids can result in serious
malfunctions and damage to the electric
drive.
Troubleshooting
Please refer to , and on page 309
and at the start of the chapter on page
Coolant
The indicator lamp flashes red.
Engine coolant temperature too high or en-
gine coolant level too low.
Do not drive on!
Stop the vehicle as soon as possible and
when safe to do so.
— Deactivate the vehicle’s drive system.
— Allow the electric drive to cool down until
the warning lamp goes out.
— Check the engine coolant level at the cool-
ant expansion tank → page 316.
If the engine coolant level is too low:
— Refill coolant → page 316.
If the warning lamp does not go out, seek ex-
pert assistance.
together with
The indicator lamps flash red.
Stop the vehicle immediately
Fault in the high-voltage coolant circuit.
— Deactivate the vehicle’s drive system.
— Seek expert assistance.
Brake fluid
Fig. 181 In the bonnet space: cap of the brake
fluid reservoir.
Brake fluid will gradually absorb water from
the surrounding air over the course of time.
The brake system will be damaged if there is
too much water in the brake fluid. The boiling
point of the brake fluid is also considerably
reduced by the water content. Heavy use of
the brakes may cause a vapour lock in the
brake system if the water content is too high.
Vapour locks reduce the braking efficiency,
considerably increase braking distance and
can even cause the brake system to fail com-
pletely. Your own safety and that of other
road users depends on having a brake system
that functions properly at all times
318
Checking and refilling