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Audi A4 (B9) 2016-2022 Owner's Manual: Cooling system


The engine cooling system is filled with a mixture of purified water and coolant additive at the factory.

This coolant must not be not changed.

The coolant level is monitored using the indicator light. However, you should occasionally check the coolant level.


The following messages may appear depending on the vehicle equipment:

Turn off engine and check coolant level. See owner's manual

The coolant level is too low.

Stop driving and switch the engine off. Check the coolant level.

Coolant temperature: too high. Please let engine run while vehicle is stationary

Let the engine run at idle for a few minutes to cool off, until the indicator light turns off.

Coolant system: malfunction! Please turn off engine

Do not continue driving, shut the engine off, and switch the ignition off. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

Coolant additive

The coolant additive is made of anti-freezing and corrosion protection agents. Only add the following coolant additives mixed with distilled water.

Checking and Filling

The amount of coolant additive that needs to be mixed with water depends on the climate where the vehicle will be operated. If the coolant additive percentage is too low, the coolant can freeze and damage the engine.

Checking and Filling


Checking coolant

Checking and Filling
Fig. 160 Engine compartment - Coolant expansion tank (diagram): 1 cover with release button: 2 markings

Checking the coolant level

The coolant expansion tank for some engines is located in the water drip tray under a cover. If necessary, remove the cover that is located under the windshield wiper on the front passenger's side.

Adding coolant

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. Audi recommends mixing the coolant additive with distilled water.

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 result from the coolant boiling due overheating and then being forced out of the cooling system.



Do not continue driving if the coolant expansion tank is empty. Do not add any coolant, because air could enter the cooling system and damage the engine. See an authorized Audi dealer or authorized Audi Service Facility for assistance.

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