engine coolant AUDI A3 2020 Owner´s Manual

Checking and Filling

Facility check if the coolant additive in your
vehicle matches the percentage appropriate
for the climate. This is especially important
when driving in colder climates.
— If the appropriate coolant additive is not
available in an emergency, do not add any
other additive. You could damage the en-
gine. If this happens, only use water and re-
store the correct mixture ratio with the
specified coolant additive as soon as possi-
ble.
— Only refill with new coolant.
— Radiator sealant must not be mixed with
the coolant.
— Due to the risk of engine damage, the cool-
ing system should only be refilled by an au-
thorized Audi dealer or authorized Audi
Service Facility. An authorized Audi dealer or
authorized Audi Service Facility can also pro-
vide you with important information about
the recommended coolant additive.
@® Tips
Applies to: RS models: In certain weather
conditions, moisture such as rain or snow may
evaporate on the radiator after stopping the
vehicle. This may cause steam to escape from
the front of the vehicle.
Applies to: vehicles with plug-in hybrid drive


Fig. 251 Engine compartment: coolant expansion tank
Your vehicle has two coolant expansion tanks
that are separate from each other:
@) expansion tank for gasoline engine and elec-
tric motor.
@®): expansion tank for the high-voltage area.
312
The expansion tank (@) must not be opened
oA.
> Switch the ignition off.
> Open the hood > page 305.
> Always check the coolant level in both coolant
expansion tanks (@) and @) using the outer
markings.
> When you fill coolant in the expansion tank (A),
please refer to > page 311, Cooling system.
> Do not drive any farther if the coolant level in
the expansion tank (@) is low. Contact an au-
thorized Audi dealer or authorized Audi Service
Facility immediately > A\.

ZA WARNING
— Read and follow the warnings in
=> page 304, General information before
opening the hood and checking the coolant
level.
— The expansion tank (8) may only be opened
and filled by an authorized Audi dealer or
authorized Audi Service Facility.
— Coolant can enter the inside of the high-
voltage battery when filling the expansion
tank @) and cause a short circuit, which in-
creases the risk of fire.

Checking coolant

RAZ-0539


MIN

Fig. 252 Engine compartment - coolant expansion tank
(diagram): @ cover; @) markings
Observe the safety precautions > page 304, Gen-
eral information.
Checking the engine coolant level
> Park the vehicle on a level surface.
> Switch the ignition off.
> Open the hood > page 305.

8V2012721BK
Checking and Filling

> Check the coolant level in the coolant expan-
sion tank > page 307, fig. 248 using the outer
markings (2) > fig. 252. The coolant level must
be between the markings (2) when the engine is
cold. When the engine is warm it can be slight-
ly above the upper marking.
Adding coolant
Applies to: vehicles with plug-in hybrid drive:
Your vehicle has two coolant expansion tanks
that are separate from each other. The smaller of
the two expansion tanks must not be opened
= page 312. Read and follow the important safe-
ty precautions > A\ in Coolant on page 312.
Requirement: there must be a residual amount of
coolant in the expansion tank >@).
If you must add coolant, use a mixture of water
and coolant additive. Mixing the coolant additive
with distilled water is recommended.
> Allow the engine to cool.
> Place a large, thick towel on the coolant expan-
sion tank cover.
> Remove the cover (@) © fig. 252 carefully to the
left > AX.
» Add the correct mixture ratio of coolant
> page 311 up to the upper marking @
> fig. 252.
> Make sure that the fluid level remains stable.
Add more coolant if necessary.
> Close the cap securely.
Coolant loss usually indicates that there is a leak.
Immediately drive your vehicle to an authorized
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
cooling system is not leaking, coolant loss can re-
sult from the coolant boiling due overheating
and then being forced out of the cooling system.

— Never open the hood if you can see or hear
steam or coolant escaping from the engine
compartment. This increases the risk of
burns. The cooling system is under pressure.
When you no longer see or hear steam or
coolant escaping, you may open the engine
compartment with caution.
—When working in the engine compartment,
remember that the radiator fan can switch
on even if the ignition is switched off, which
increases the risk of injury.
— Coolant additive and coolant can be danger-
ous to your health. For this reason, store the
coolant in the original container and away

from children. There is a risk of poisoning.

@) Note
Do not add coolant if the expansion tank is
empty. Air could enter the cooling system and
damage the engine. If this is the case, do not
continue driving. See an authorized Audi deal-
er or authorized Audi Service Facility for assis-
tance.
Brake fluid

BFV-0229)



Z\ WARNING
— The engine compartment in any vehicle can
be a dangerous area. Stop the engine and al-
low it to cool before working in the engine
compartment. Always follow the informa-
tion found in > page 304, General informa-
tion.


Fig. 253 Engine compartment: cap on brake fluid reservoir
Observe the safety precautions > page 304, Gen-
eral information.
Checking the brake fluid level
Read the brake fluid level on the brake fluid res-
ervoir > page 307, fig. 248. The brake fluid level
must be between the MIN and MAX markings
>A.
The brake fluid level is monitored automatically. >
313