engine overheat AUDI Q7 2015 Owner´s Manual

26 2 Ch eck ing and filling
8_ WARNING
Stop! Before working in the engine com­
partment, always read and heed all WARN ­
INGS
~ .&. in Working in the engine com­
partment on page
256 . The engine com­
partment of any motor veh icle is a poten­
tially dangerous area and can cause ser i­
ous personal injury.
8_ WARNING ,,,__
If you must change the engine oil in your
vehicle:
- Always wea r eye protection .
- T o reduce the ris k of burns from hot en-
gine oil let the engine cool down to the
touch.
- Whe n removing the oil drain plug with
yo ur fingers, stay as far away as poss ible.
Always keep your forearm paralle l to the
ground to he lp prevent hot oil from run­
ning down your arm.
- Drain the oi l into a container designed
for this pu rpose, one large enough to
hold at least the total amount of oil in
your engine.
- To reduce the risk of poisoning, never use
empty food or beverage containers that
might m islead someone into dr ink ing
from them.
- Engine oil is poisonous. Keep it well out
of the reach of children.
- Cont inuous contact with used engine oil
is harmful to your skin. Always protect
your sk in by washing thoroughly with
soap and water .
(D Note
Never mix oil additives with your engine
oil. These additives can damage your en­
gine and adverse ly affect your Audi Limit­
ed New Vehicle Warranty.
@i For the sake of the environment
- Before changing the oil, first make sure
you know where you can properly dispose of the old oil.
-
.
- Always dispose of used oil p roperly. Nev ­
er dump it on garden soil, in wooded
areas, into st reams or down sewage
dra ins.
- Recycle used oi l by taking it to a used en­
gine oil collection facility in your area, or
contact a service station.
- We strongly recommend that yo u have
your oil changed by an authorized Audi
dealer or a qualified workshop with the
special tools and expert ise required, and
proper means of disposal.
Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro­
tects the engine from freezing in the winter.
T he cooling sys tem is sealed and genera lly re­
quires little attention.
The cooling system has been fi lled at the fac­
tory with a permanent coolant which does not need to be changed. The coo lant cons ists of a
mixtu re of specially conditioned water and the
manufacturer's g lycol -basedcoo la nt add
i-
tive G l3 antifreeze with anticorrosion addi ­
tives (SO% for USA mode ls; 60% for Canadian
models). This mixture both assures the neces­
sary frost protection and protects metal com­
ponents in the eng ine's cooling system from
corros ion and scaling.
It also ra ises the bo il­
i ng po int of the coolant .
Do not reduce the concentration of the cool­
ant in the summer by adding p lain wate r. Th e
proportion of coo lant additiv e mu st be at
l e as t 50 °/4 but not m ore than 60°/4
to main­
ta in ant ifreeze protect io n and cooling eff ic ien­
c y.
If the coo lant fros t protection is too low,
the coolant could freeze and damage the vehi­
cle heating and engine cooling system.
For year- round driving, antifreeze is added at
t h e factory fo r temperatures down to:
- -31°F(-35°C)USA
- - 40 °F ( - 40 °C) Canada.

264 Check ing and filling
Coolant lo ss
Coolant loss may indicate a l ea k in t he cooling
system. In the event of coolant loss, the cool ­
ing system should be inspected immediately
by your authorized Audi dealer. It is not
enough merely to add coolant.
I n a
se ale d system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheating.
A WARNING
The cooling system is under pressure and
can get very hot. Reduce the risk of scald­
ing from hot coolant by following these
steps.
- Turn off the engine and allow it to cool
down.
- Protect your face, hands and arms from
escaping fluid and steam by covering the
cap with a large, thick rag .
- Turn the cap slowly and very carefully in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
top of the cap .
- To avoid being burned, do not spill ant i­
freeze or coolant on the exhaust system
or hot eng ine parts. Under certain condi­
t io ns, the ethy lene g lycol in engine cool­
an t ca n ca tch f ire.
0 Note
Do not add any type of radiator leak seal­
ant to your vehicle's eng ine coolant. Add­
ing radiato r repair fluid may adve rsely af­
fect the function and performance of your
cooling system and could res ult in damage
not covered by your New Vehicle Limited
Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything i n the engine com­
pa rtmen t,
a lwa ys read and heed all WARN ­
INGS c:::> A in Working in the engine compart ­
ment on page 256.
.. Tu rn off the engine .
.. Let the engine cool down.
.. Place a thick rag over the coo lant expansion
tank
c> page 263 , fig. 246 and carefully
twist the cap counter-clockwise c> ,&. .
.. Add coo lant m ixed in the correct rat io
c:::> page 262, Coolant.
.. Twist the cap o n again tightly.
Rep lacement engine coo lant must conform to
exact spec ificat ions
c> page 262, Coolant.
We recommend using only coo lant add it ive
G12 ++, G13 or in an emergency G12 +. Do
not
use a different add itive. In an emergency use
plain water until you can get the correct addi­
t ive and can restore the correct ratio . This
shou ld be done as soon as poss ib le.
If you have lost a considerab le amount of
coolant, the n you should add cold ant ifreeze
and co ld water on ly when the eng ine is cold .
Always use
new engine coolant when refilling.
Do not fi ll coo lant above the "MAX" mark. Ex­
cess coolant will be forced o ut through the
pressure relief valve in the cap when the en­
gine becomes hot.
A WARNING
- The cooling system is under pressure and
can get very hot. Reduce the risk of
scalding from hot coolant by following
these steps.
- Turn off the engine and allow it to coo l
down.
- Protect your face, hands and arms from
escaping fluid and steam by covering
the cap with a large, th ick rag.
- Turn the cap s low ly and very carefully
in a counter-clockwise direction while
applying light, downward pressure on
the top of the cap.
- To avoid being burned, do not spill an­
tifreeze or coolant on the exhaust sys­
tem or hot engi ne parts. Under certain
cond it ions, the ethylene g lycol in e n­
gine coolant can catch fire .