
Checking and refilling levels
214
WARNING
All work on the engine or in the engine compartment, e.g. checking and 
refilling fluids, involves the danger of injury and scalding as well as the risk 
of accident or fire.•
Never open the bonnet if you see steam, smoke or coolant escaping 
from the engine compartment. Otherwise, there is a risk of sustaining 
burns. Wait until no more steam or  coolant is emitted, then allow the 
engine to cool before carefully opening the bonnet.
•
Switch off the engine and remove the key from the ignition.
•
Apply the handbrake and move the gea r stick to neutral or selector 
lever to position P.
•
Keep children away from the vehicle.
•
Never touch hot engine parts. There is a risk of burns.
•
Never spill liquids on a hot engine or on a hot exhaust gas system. This 
is a fire hazard.
•
Avoid causing short-circuits in the electrical system, particularly at the 
points where the jump leads are attached  ⇒page 263. 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 belt s, alternator, radiator fan, etc., and 
from the high-voltage ignition system. You should also observe the 
following points:
−Never touch the electrical wiring 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!
WARNING (continued)
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Checking and refilling levels221
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
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 213.
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 underneath 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 273.
Make sure that the coolant meets the required specifications ⇒ page 220. 
Do not use a different type of additive if coolant additive G 12+ is not avail-
able. In this case use only water and  bring the coolant concentration back up 
to the correct level as soon as possible by putting in the specified additive 
⇒ page 220.
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 coolant additive G 12+ (dyed purple) may be mixed with G 12 (dyed red) 
and also with G 11.
WARNING
Any work carried out in the engine compartment or on the engine must be 
carried out cautiously.•
When working in the engine compartm ent, always observe the safety 
warnings  ⇒page 213.
Fig. 161  In the engine 
compartment: Coolant 
expansion tank cap
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Checking and refilling levels
222•
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
•
When mixed with other additives the colour of G 12 will change to brown. 
If this occurs you should have the coolant changed immediately. Failure to do 
so will result in engine damage!
•
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 flui d container in the engine compartment.
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.
WARNING (continued)
Fig. 162  In the engine 
compartment: Cap of 
windscreen washer fluid 
reservoir.
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Technical Data273
Safety First
Operating instructions
Practical tips
Te c h n i c a l  D a t a
Te 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
Windscreen washer fluid reservoir
Engine oil filler cap
Engine oil dipstick
Brake fluid reservoir
Vehicle battery (underneath the cover)
The checking and refilling of service fluids are carried out on the components 
mentioned above. These operations are described in the  ⇒page 213. Overview
Further explanations, instructions and restrictions on the technical data are 
contained as of 
⇒page 269.
Fig. 203  Diagram for the 
location of the various 
elements
A1A2A3A4A5A6
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