Audi A3

since 1997 of release

Repair and car operation

Audi A3
+ Maintenance instruction
+ Current leaving and service
+ Engine
- Systems of cooling, heating
   - System of cooling of the engine
      Antifreeze – means of protection from freezing
      Replacement of cooling liquid
      Removal, installation and thermostat check
      Removal and radiator and fan installation
      Removal and installation of the pump of cooling liquid
      Check of system of cooling under pressure
      Check of a thermoswitch of the fan of cooling
   + Systems of ventilation, heating and air conditioning
+ the Power supply system and production of the fulfilled gases
+ engine Electric equipment
+ Manual box of gear shifting
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Elektroskhema


Antifreeze – means of protection from freezing


The system of cooling of the engine during the whole year is filled with a water mix with antifreeze and the corrosion and protective AUDI components. This mix interferes with freezing and corrosion of elements of system, and also formation of limy deposits and increases temperature of boiling of liquid. Owing to expansion of cooling liquid when heating in system there is a superfluous pressure which also promotes temperature increase of boiling of liquid. Pressure of liquid is limited to the safety valve, being in a cover of a broad tank which comes off at pressure 1.2 – 1.5 bar. Increase of a boiling point of liquid is required for reliable functioning of system of cooling of the engine. At low temperature of boiling of liquid there can be a thermal stagnation owing to what efficiency of circulation of liquid and engine cooling decreases.

At cars with chassis number to «8LVA006233» (release at the end of 1996) is serially applied AUDI G11-A8C antifreeze. G11–A8C can be applied to addition of system or another with a mark “according to TL–VW 774 C”. A sign of this antifreeze is green color.

Since 8LVA006234 chassis number, G12 antifreeze is serially applied. G12 can be applied to addition of system or other antifreeze with a mark “according to TL–VW 774 D”. A sign is red color.

Do not mix G11 and G12, it can lead to heavy damages of the engine. The mix has brown color. It is necessary to remove it at once.
Engines, with system of cooling filled with G11 antifreeze, can be transferred to G12 antifreeze. For this purpose it is necessary to merge completely liquid from cooling system. Then it is necessary to fill system with pure water and let's work to the engine within 2 minutes. After that water merges from system and is blown by the compressed air through a broad tank that provides complete removal of water. Close a stopper and fill system with a new mix of water and G12 antifreeze.
It is necessary to apply only water "/G12" AUDI mix (red color), even in a warm season. Water should be pure and should not contain some lime. In summertime of year the content of antifreeze in cooling liquid also should not be lower than 40 %. Therefore at water addition in system it is necessary to add also and antifreeze.

Composition of cooling liquid, l

Protection to – 25°С
G12 2.0 l
Water 3.0 l
Protection to – 35°С
G12 2.5 l
Water 2.5 l
The filled volume 5.0 l

In our widths protection against freezing should be provided to temperature – 25°С, it is better to – 35°С. The share of antifreeze cannot exceed 60 % (protection to – 40°С). Extent of protection otherwise decreases and engine cooling worsens.


Depending on the car equipment the volume of liquid filled in in system can differ from the given values.