Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
- Systems of cooling, heating
   - System of cooling of the engine
      Antifreeze – a protection frame from freezing
      Replacement of a cooling liquid
      Removal, installation and thermostat check
      Removal and radiator and fan installation
      Removal and installation of the pump of a 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 release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Antifreeze – a protection frame from freezing


The system of cooling of the engine within all year is filled by a mix of water with antifreeze and korrozionno-protective components AUDI. This mix interferes with freezing and corrosion of elements of system, and also formation of limy adjournment and raises temperature of boiling of a liquid. Owing to expansion of a cooling liquid at heating in system there is a superfluous pressure which also promotes rise in temperature of boiling of a liquid. Pressure of a liquid is limited to a 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 a liquid is required for reliable functioning of system of cooling of the engine. At low temperature of boiling of a liquid there can be a thermal stagnation owing to what efficiency of circulation of a liquid and engine cooling decreases.

At cars with number of the chassis to 8LVA006233 (release in the end of 1996) is serially applied antifreeze AUDI G11–A8C. To system addition it can be applied G11–A8C or another with a mark “it agree TL–VW 774 C”. A sign of this antifreeze is green colour.

Since chassis number 8LVA006234, antifreeze G12 is serially applied. To system addition it can be applied G12 or other antifreeze with a mark “it agree TL–VW 774 D”. A sign is red colour.

Do not mix G11 and G12, it can lead to heavy damages of the engine. The mix has brown colour. It is necessary for removing at once.
Engines, with system of cooling filled with antifreeze G11, can be translated on antifreeze G12. For this purpose it is necessary to merge completely a liquid from cooling system. Then it is necessary to fill system with pure water and to allow to work to the engine within 2 minutes After that water merges from system and it is blown by compressed air through a broad tank that provides full removal of water. Close a stopper and fill system with a new mix of water and antifreeze G12.
It is necessary to apply only a mix water / G12 AUDI (red colour), even in a warm season. Water should be pure and should not contain to exhaust. In summertime of year the antifreeze maintenance in a cooling liquid also should not be below 40 %. Therefore at water addition in system it is necessary to add also and antifreeze.

Structure of a cooling liquid, l

Protection To – 25С
G12 2.0 l
Water 3.0 l
Protection To – 35С
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-25S, it is better to-35S. The antifreeze share cannot exceed 60 % (protection to-40S). Degree of protection Otherwise decreases and engine cooling worsens.


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

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