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Checking and refilling levels
182•
Avoid causing short-circuits in the electrical system, particularly at the
points where the jump leads are attached ⇒page 227. The battery could
explode.
•
Never touch the radiator fan. It is temperature controlled and could
start automatically, even when the engine has been switched off and the
key removed from the ignition!
•
Do not unscrew the cap on the expansion tank when the engine is hot.
If the coolant is hot, the cooling system will be pressurised!
•
Protect face, hands and arms by covering the cap with a large, thick
cloth to protect against escaping coolant and steam.
•
Always make sure you have not left any objects, such as cleaning cloths
and tools, in the engine compartment.
•
If you have to work underneath the vehicle, you must use suitable
stands additionally to support the vehicle, there is a risk of accident!. A
hydraulic jack is insufficient for securing the vehicle and there is a risk of
injury.
•
If any work has to be performed when the engine is started or with the
engine running, there is an additional, potentially fatal, safety risk from the
rotating parts, such as the drive belts, alternator, radiator fan, etc., and
from the high-voltage ignition syst em. You should also observe the
following points:
−Never touch the electrical wiri ng of the ignition system.
− Ensure that jewellery, loose clothing and long hair do not get
trapped in rotating engine parts. Danger of death. Before starting any
work remove jewellery, tie back and cover hair, and wear tight-fitting
clothes.
− Always think carefully about pressing the accelerator if a gear is
engaged in either an automatic or manual gearbox. The vehicle could
move, even if the handbrake is applied. Danger of death.
•
If work has to be carried out on the fuel system or on electrical compo-
nents, you must observe the following safety notes in addition to the above
warnings:
−Always disconnect the battery. The vehicle must be unlocked when
this is done, otherwise the alarm will be triggered.
− Do not smoke.
− Never work near naked flames.
− Always have a fire extinguisher on hand.Caution
When changing or topping up service fluids, make absolutely certain that you
fill the fluids into the correct reservoirs. Failure to observe this point will result
in serious malfunctions and engine damage!
For the sake of the environment
Service fluids leaks are harmful to th e environment. For this reason you
should make regular checks on the ground underneath your vehicle. If you
find spots of oil or other fluids, have your vehicle inspected in a qualified
workshop.
WARNING (continued)
WARNING (continued)
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Page 191 of 260

Checking and refilling levels189
Safety First
Operating instructions
Practical tips
Te c h n i c a l D a t a
Caution
•
Other additives may give considerably inferior corrosion protection. The
resulting corrosion in the cooling system can lead to a loss of coolant,
causing serious damage to the engine.
•
If additive G12++ is not available, t his can be mixed with G12+, bearing in
mind that the protection against corrosion will be reduced.
Checking the coolant level and topping up
The correct coolant level is important for fault-free func-
tioning of the engine cooling system.Before opening the bonnet, read and observe the warnings ⇒ in
“Safety instructions on working in the engine compartment” on
page 181. Opening the coolant expansion tank
– Switch off the engine and allow it to cool.
– To prevent scalding, cover the cap on the expansion tank with a
thick cloth and carefully unscrew the cap ⇒.
Checking coolant level
– Look into the open coolant expansion tank and read off the coolant level.
– If the level is below the “MIN” mark, top up with coolant.
Topping up coolant
–Only use new coolant.
– Do not fill above the “MAX” mark.
Closing the coolant expansion tank
–Screw the cap on again tightly.
The position of the coolant expansion reservoir is shown in the corresponding
engine compartment diagram ⇒page 238.
Ensure the coolant conforms to the required specifications. Do not use a
different type of additive if coolant ad ditive G 12++ is not available. In this
case use only water and bring the coolant concentration back up to the
correct level as soon as possible by topping up with the specified additive.
Always top up with new coolant.
Do not fill above the “MAX” mark. Otherwise the excess coolant will be forced
out of the cooling system when the engine is hot.
The additive G 12++ can be mixed with the G 12+ in any proportion.
Fig. 128 In the engine
compartment: Coolant
expansion tank cap
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Checking and refilling levels
190
WARNING
Any work carried out in the engine compartment or on the engine must be
carried out cautiously.•
When working in the engine compartment, always observe the safety
warnings ⇒ page 181.
•
When the engine is warm or hot, th e cooling system is pressurised! Do
not unscrew the cap on the expansion t ank when the engine is hot. This is
a burn injury risk.Caution
•
If you notice a change in the colour of the liquid because it has been in
use for a long time, it should be changed, as it will have lost some of its prop-
erties and could cause damage to the vehicle.
•
If a lot of coolant has been lost, wait for the engine to cool down before
putting in cold coolant. This avoids damaging the engine. Large coolant
losses are an indication of leaks in the cooling system. See a specialised
workshop immediately and have the cooling system checked. Otherwise,
there is a risk of engine damage.
Washer fluid and windscreen wiper bladesTopping up washer fluid
The water for cleaning the windscreen should always be
mixed with washer fluid.The windscreen washer and the headlight washing system are supplied with
fluid from the windscreen washer fluid container in the engine compartment.
The container holds approx. 2 litres; in vehicles with headlamp washers* it
holds approx. 4.5 litres.
The reservoir is located on the right-hand side of the engine compartment.
Plain water is not enough to clean the windscreen and headlights. We recom-
mend that you always add a product to the windscreen washer fluid.
Approved windscreen cleaning products exist on the market with high deter-
gent and anti-freeze properties, these may be added all-year-round. Please
follow the dilution instructions on the packaging.
Fig. 129 In the engine
compartment: Cap of
windscreen washer fluid
reservoir.
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Page 240 of 260
Technical Data
238Te c h n i c a l D a t aChecking fluid levelsFrom time to time, the levels of the different fluids in the
vehicle must be checked. Never fill with incorrect fluids,
otherwise serious damage to the engine may be caused.
Coolant expansion tank
Engine oil dipstick.
Engine oil filler cap
Brake fluid reservoir
Battery
Windscreen washer fluid container
The checking and refilling of service fluids are carried out on the components
mentioned above. These operations are described in the ⇒page 181. Overview
Further explanations, instructions and restrictions on the technical data are
contained as of
⇒page 233.
Note
The layout of parts may vary depending on the engine.
Fig. 166 Diagram for the
location of the various
elements
A1A2A3A4A5A6
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