4.1.1. Antifreeze – a security measure from freezing

The engine cooling system during the whole year is filled with 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 liquid boiling temperature. Owing to expansion of cooling liquid when heating in system there is excessive pressure which also promotes liquid boiling temperature increase. Pressure of liquid is limited to the safety valve, being in a cover of a broad tank which comes off with a pressure of 1.2 - 1.5 bars. Increase in a boiling point of liquid is required for reliable functioning of the cooling system of the engine. At a low temperature of boiling of liquid there can be a thermal stagnation owing to what efficiency of circulation of liquid and cooling of the engine decreases.

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

Starting with number of the 8LVA006234 chassis, G12 antifreeze is serially applied. G12 or other antifreeze with a mark "according to TL-VW 774 D" can be applied to addition of system. A sign is red color.
ATTENTION

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


Composition of cooling liquid, l
Protection to – 25 °C
G12 2.0 l
Water 3.0 l
Protection to – 35 °C
G12 2.5 l
Water 2.5 l
The filled volume 5.0 l

In our latitudes protection against freezing have to be provided up to the temperature of -25 °C, up to -35 °C better. The share of antifreeze cannot exceed 60% (protection to –40 °C). Otherwise degree of protection decreases and cooling of the engine worsens.
ATTENTION

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