Get Checking and topping up fluids -> Cooling system Guide for Audi RS6 4 Door Fourth Generation (2019-2025)

Checking and topping up fluids

►

Unscrew the cap  from the oil filler opening

ðFig. 129.

Carefully add 0.5 litres of suitable engine oil

The cooling system is filled at the factory with a

mixture of conditioned water and coolant addi-

tive. This coolant must not be changed.

►

ðpage 237.

Screw the filler cap back on.

Close the bonnet ðpage 236.

Switch the ignition on again after two minutes

The coolant level is monitored by a warning lamp

►



. However, it is advisable to check it occasion-

►

ally.

►

and read off the current oil level on the MMI

Coolant additive

ðpage 239, Checking the engine oil level.

Applies when using engine oil that corresponds

to the specified standard: Add a little more en-

gine oil if necessary.

The coolant additive contains anti-freeze and cor-

rosion protection agent. When topping up, use

only the type of coolant additive specified below,

in combination with distilled water.

►

Coolant additive

G12evo

Specification

TL 774 L

WARNING

– Ensure that no oil comes into contact with

hot engine components when topping up:

this could cause a fire.

The amount of coolant additive which needs to

be mixed with the water depends on the temper-

atures to be expected in the winter season. If the

anti-freeze concentration is too low, the coolant

can freeze and cause engine damage.

– The oil filler cap must be properly closed to

prevent oil from squirting onto the hot en-

gine or exhaust system while the engine is

running – risk of fire!

Climate region Coolant

additive

Frost protec-

tion

– Wash your skin thoroughly if it comes into

contact with engine oil.

– Engine oil is poisonous and must be kept out

of the reach of children.

Hot regions

min. 40 %

max. 45 %

min. -25 °C

(-13 °F)

– Store the engine oil safely in the original

container.

Cold regions

min. 50 %

max. 55 %

max. -40 °C

(-40 °F)

CAUTION

No additives should be used with engine oil.

These could cause engine damage.

– Have your qualified workshop check the

cooling system before the winter season to

make sure that the anti-freeze concentra-

tion is adequate for the conditions to be ex-

pected. This applies particularly if you drive

into a colder climate zone.

For the sake of the environment

– Never pour oil down drains or into the

ground.

– Always observe local regulations when dis-

posing of empty oil canisters.

– Adjustments to the amount of coolant addi-

tive to suit colder temperatures must al-

ways be carried out by a qualified workshop;

otherwise there is a risk of engine damage.

The vehicle has several coolant circuits that

can only be filled by a qualified workshop

that has the necessary special tools.

Cooling system

Information on coolant

Please refer to the safety information

ðpage 234, Safety information on the engine

compartment.

– To prevent damage to the engine, do not

use a different type of coolant additive if

G12evo is not available. In this case use only

clean, ideally distilled water and have the

coolant concentration brought back up to



240

Checking and topping up fluids

the correct level as soon as possible with

the specified additive.

There is a fault in the cooling system. Do not

drive on. Check the coolant level ðpage 241,

Checking the coolant level. If the indicator lamp

disappears after the coolant level has been

checked and coolant has been added if necessary,

you can continue driving. Do not drive on if the

indicator lamp does not disappear. Seek profes-

sional assistance.

– Always top up with fresh, unused coolant.

– Radiator sealants must not be added to the

coolant.

– The cooling system must be refilled by a

qualified workshop only – risk of engine

damage! You can obtain important informa-

tion about recommended anti-freeze addi-

tives from your qualified workshop.

Checking the coolant level

CAUTION

– Auxiliary headlights and other attachments

in front of the cooling air inlet reduce the

cooling effect of the coolant. At high out-

side temperatures and high engine loads,

there is a risk of the engine overheating.

– The front spoiler also ensures proper distri-

bution of the cooling air when the vehicle is

moving. If the spoiler is damaged this can

reduce the cooling effect, which could cause

the engine to overheat. Seek professional

assistance.

Driver messages about the cooling system

The following driver messages may appear, de-

pending on the equipment installed in your vehi-

cle:

 Coolant temperature: too high! Please

Fig. 130 Engine compartment: Coolant expansion tank for

combustion engine.

inside coolant tank (visible when cap is opened – risk of

scalding!)

marks on expansion tank,

marks

switch off engine

Switch off the engine and do not drive on. Wait

approx. 15 minutes and then restart the engine.

Do not drive on if the indicator lamp does not dis-

appear. Seek professional assistance.

 Coolant temperature: high. Please adapt

driving style

You can continue driving. The air conditioner out-

put will be restricted. The performance may be

restricted. Continue driving in a moderate style

or allow the engine to idle until the indicator

lamp disappears. If the indicator lamp still does

not disappear, do not drive on. Seek professional

assistance.

Fig. 131 Engine compartment: Coolant expansion tank for

electrical components.

Please refer to the safety information

ðpage 234, Safety information on the engine

compartment.



Cooling system: fault. Please contact work-



shop

241

Checking and topping up fluids

►

Your vehicle may have two separate coolant ex-

pansion tanks depending on its equipment

ðpage 237, Fig. 126. One expansion tank is for

the combustion engine (black cap) ðFig. 130

and the other one is for the electrical compo-

nents (blue cap) ðFig. 131. Please refer to the

Read the coolant level on the inside of the ex-

pansion tank B ðFig. 130.

If you did not need to top up the coolant, screw

the black cap on clockwise until you feel the

second point of resistance.

Please read the information on ðpage 240,

Cooling system before topping up the coolant

in the coolant expansion tank.

►

safety information ð

Preparations before checking the coolant

level

Topping up the coolant

►

Park the vehicle on a level surface.

Switch the vehicle off. (The ignition must re-

Important: A visible amount of coolant must re-

►

main in the coolant expansion tank ð

main switched off throughout the process of

checking and topping up the coolant.)

Open the bonnet ðpage 236.

If you do need to top up the coolant, use a mix-

ture of distilled water and the specified coolant

additive. Only use non-distilled water in an emer-

gency. Always use clean water.

►

Applies to 4-cylinder petrol engine: Wait for at

least 15 minutes after switching off the engine;

otherwise the coolant level reading may be in-

correct.

Applies to vehicles with cooling of electrical com-

ponents: The caps for the two coolant expansion

►

When the coolant is cold, the coolant level for

tanks must not be swapped over ð

each coolant expansion tank should be between

marks 1 and 2 ðFig. 130 or ðFig. 131. The

coolant level may initially be slightly above the

top mark 1 on new vehicles. This may also be

the case if the engine is warm.

Coolant circuit for combustion engine: black cap

ðFig. 130

Applies to vehicles with cooling of electrical com-

ponents: Coolant circuit for electrical compo-

nents: blue cap ðFig. 131

►

You can read the coolant level using the outer

or inner markings on the coolant expansion

tank.

►

Wait for the engine to cool down.

Cover the cap on the expansion tank you intend

►

to open with a large, thick cloth.

Carefully unscrew the cap for the affected cool-

Checking the coolant level based on marks

on the outside

►

ant circuit ðFig. 130 A or ðFig. 131 by turn-

►

Read the coolant level on the outside of the ex-

pansion tank A ðFig. 130 or ðFig. 131.

Please read the information on ðpage 240,

Cooling system before topping up the coolant

ing it anti-clockwise ð

►

Add coolant in the correct concentration

ðpage 240 up to mark 1 .

You should make sure that the fluid level re-

mains stable. If necessary, add more coolant.

Screw the cap on clockwise until you feel the

second point of resistance.

►

in the coolant expansion tank.

Checking the coolant level based on marks

on the inside

Applies to: coolant expansion tank for combustion engine

WARNING

Please refer to the safety information

ðpage 234, Safety information on the engine

compartment.

– The engine compartment of any motor vehi-

cle is a potentially hazardous area. Before

carrying out any work in the engine com-

partment, switch off the vehicle and allow

the cooling system to cool down. Please ob-

serve the important safety warnings

ðpage 234, Safety information on the en-

gine compartment.

►

Wait for the engine to cool down.

►

Cover the cap on the expansion tank with a

large, thick cloth.

►

Carefully unscrew the black cap for the affected

coolant circuit A ðFig. 130 by turning it anti-



clockwise ð

242

Checking and topping up fluids

bustion engine ðFig. 130, blue cap for elec-

trical components ðFig. 131.

– Never open the bonnet if you can see or hear

steam or coolant escaping from the engine

compartment; there is a risk of being scal-

ded. The cooling system is under pressure.

Wait until you can no longer see or hear es-

caping steam or coolant.

Brake fluid

Checking the brake fluid

– When working in the engine compartment

be aware that the radiator fan may start

running suddenly, even if the ignition is

switched off – risk of injury!

– The coolant and coolant additives can be a

health hazard. Store the coolant additive in

the original container in a safe place out of

reach of children – risk of poisoning.

CAUTION

Fig. 132 Engine compartment: Cap of brake fluid reservoir

Coolant loss which leads to the coolant ex-

pansion tank being empty normally indicates

significant leaks in the cooling system which

could result in further damage. In this case,

do NOT drive on. Seek professional assistance.

– Do not add coolant if the expansion tank is

empty. Air could have got into the cooling

system – risk of damage! In this case, do

NOT drive on. Seek professional assistance.

– If there is a visible amount of coolant re-

maining in the tank, add more coolant.

Fig. 133 Engine compartment: Removing cover for brake

fluid reservoir

Drive to a qualified workshop without delay

and have the fault rectified. If the warning/

Please refer to the safety information

ðpage 234, Safety information on the engine

compartment.



indicator lamp  /

comes on again,

stop the vehicle and switch off the ignition.

Seek professional assistance.

Checking the brake fluid level

– If too much coolant has been added to the

coolant expansion tank, drive to a qualified

workshop soon and have the coolant level

corrected.

The brake fluid reservoir is located underneath a

cover in the engine compartment on the driver's

side.

– If you use non-distilled water, the chemicals

that it contains can cause serious corrosion

damage to the engine – risk of engine dam-

age!

►

Park the vehicle on a level surface.

Open the bonnet ðpage 236.

Remove the cover below the windscreen on the

driver’s side. To do so, lift the cover slightly at

the front 1 and detach it 2 ðFig. 133.

Read off the brake fluid level on the brake fluid

reservoir ðpage 237. The brake fluid level

must be between the MIN and MAX marks

►

– If you have used a large quantity of non-dis-

tilled water (more than 0.5 ltr.) in an emer-

gency, drive directly to a qualified workshop

and have the coolant changed.

►

– Applies to vehicles with cooling of electrical

components: The caps for the two coolant

expansion tanks must not be swapped over

– risk of engine damage! Black cap for com-

►

Fit the cover securely again below the wind-

screen. To do so, press the cover down at the



243

Checking and topping up fluids -> Cooling system for Your Audi RS6 4 Door Fourth Generation (2019-2025)

Related Topics

Popular Owner Manuals

Latest Owner Manuals