Get Checking and Filling -> Electrical system(low battery warning) Guide for Audi S Q5 SUV Third Generation (2025-2026)

Checking and Filling

►

authorized Audi Service Facility can also pro-

vide you with important information about

the recommended coolant additive.

Plug-in hybrid drive: If coolant is missing from

the high-voltage system coolant expansion

tank, do not continue driving. Contact an au-

thorized Audi dealer or authorized Audi Service

Facility immediately ð

Checking coolant

Adding coolant

Applies to: coolant expansion tank for combustion engine

Requirement: there must be some coolant re-

maining in the expansion tank for the combus-

tion engine ð

If you must add coolant, use a mixture of distilled

water and the specified coolant additive. Only

use non-distilled water in emergency situations.

Always use clean water only.

Fig. 171 Engine compartment - coolant expansion tank

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Allow the engine to cool.

(diagram):

cover with release button;

coolant expan-

sion tank markings

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Place a large, thick towel on the coolant expan-

sion tank cap.

Push the release button 1 ðfig. 171 on the

cap and carefully turn it to the left until you

Observe the safety precautions ðpage 250, Gen-

eral information.

►

feel resistance ð

Push the release button again and remove the

cap completely.

Add coolant mixed in the correct ratio

ðpage 258 up to the MAX marking.

Make sure that the fluid level remains stable.

Add more coolant if necessary.

Turn the cap to the right to tighten it until you

feel resistance a second time.

Applies to: vehicles with plug-in hybrid drive:

Your vehicle has two coolant expansion tanks

that are separate from each other ðpage 253,

fig. 168. One expansion tank for the combustion

engine and one tank for the high-voltage system.

The coolant expansion tank for the high-voltage

system is sealed and must not be opened ð

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and ð

Checking the coolant level

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WARNING

Park the vehicle on a level surface.

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Turn off the ignition.

Open the hood ðpage 252.

Check the coolant level in the coolant expan-

sion tank ðpage 253, fig. 168 using the outer

markings 2 ðfig. 171. 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.

– The engine/motor compartment in any vehi-

cle is a potentially dangerous area. Shut off

the engine, turn off the ignition, and allow

the engine to cool before working in the en-

gine compartment. Always follow the infor-

mation found in ðpage 250, General infor-

mation.

►

– 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.

►

Conventional drive system: If you add coolant

to the expansion tank, please refer to

ðpage 258, Cooling system and ðpage 259,

Adding coolant.

►

Plug-in hybrid drive: If you add coolant to the

coolant expansion tank for the combustion en-

gine, see ðpage 258, Cooling system and

ðpage 259, Adding coolant.

– When working in the engine compartment,

remember that the radiator fan can turn on



259

Checking and Filling

Audi dealer or authorized Audi Service Fa-

cility for assistance.

even if the ignition is turned off, which in-

creases the risk of injury.

– Applies to: coolant expansion tank for com-

bustion engine: if there is too much coolant

in the expansion tank after adding coolant,

drive to an authorized Audi dealer or author-

ized Audi Service Facility as soon as possible

to have the coolant level corrected.

– Using non-distilled water increases the risk

of engine damage. Its chemical components

may cause significant corrosion damage in

the engine.

– 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.

WARNING

Applies to: vehicles with plug-in hybrid drive

The sealed cap on the high-voltage system

coolant expansion tank must only be opened

or filled by an authorized Audi dealer or au-

thorized Audi Service Facility.

– If you had to add a large amount of non-dis-

tilled water (more than 0.5 liter), then im-

mediately drive to an authorized Audi dealer

or authorized Audi Service Facility to have

the coolant changed.

– The cap of the coolant expansion tank for

the high-voltage system is equipped with a

seal that must never be removed under any

circumstances ðpage 253, fig. 168. If the

coolant expansion tank for the high-voltage

system is not sealed, please contact an au-

thorized Audi dealer or authorized Audi

Service Facility.

Brake fluid

– When adding coolant, it may leak into the

inside of high-voltage components and

cause a short circuit, increasing the risk of

fire.

Note

Coolant loss that results in the coolant expan-

sion tank becoming nearly empty primarily in-

dicates that there are significant leaks in the

cooling system, which can lead to further

damage.

Fig. 172 Engine compartment: cap on brake fluid reservoir

Observe the safety precautions ðpage 250, Gen-

eral information.

– Applies to: coolant expansion tank for com-

bustion engine: Do not add coolant if the ex-

pansion tank is empty. Air could enter the

cooling system and increase the risk of dam-

age. If this is the case, do not continue driv-

ing. See an authorized Audi dealer or au-

thorized Audi Service Facility for assistance.

– Applies to: coolant expansion tank for com-

bustion engine: If there is any coolant re-

maining, add additional coolant. Drive to an

authorized Audi dealer or authorized Audi

Service Facility immediately to have the

malfunction corrected. If the  indicator

light turns on again, do not continue driving

and turn off the ignition. See an authorized

Checking the brake fluid level

The brake fluid reservoir is located under a cover

on the driver’s side.

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Park the vehicle on a level surface.

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Lift the cover ðpage 253, fig. 168 at both

openings and remove it.

►

Read the brake fluid level on the brake fluid

reservoir ðpage 253, fig. 168. The brake fluid

level must be between the MIN and MAX mark-

ings ð

The brake fluid level is monitored automatically.



260

Checking and Filling -> Electrical system(low battery warning) for Your Audi S Q5 SUV Third Generation (2025-2026)

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