1.6.18. A cooling liquid

The cooling liquid provides engine cooling. The additive share to a cooling liquid is defined it моростойкостью during winter time.

At factory the system of cooling of the engine of the car refuels the cooling liquid which is intended for long-term work and not demanding replacement. The liquid consists of water and additive G12 +, representing antifreeze on the basis of glycol with anticorrosive additives.

The additive share to a cooling liquid depends on environmental conditions of operation of the car. At an insufficient share of an additive to a cooling liquid the liquid can freeze. Refusal of a contour of cooling and heating is as a result possible.

As a rule, the mix consists of water (60 %) and an additive (40 %). The given mix not only provides necessary frost resistance to-25 С, but also protects from corrosion first of all metal components of system of cooling. Besides, adjournment of a scum is prevented and considerably the liquid boiling point raises.

As the additive to a cooling liquid use only G12 + or an additive under the specification TL-VW 774 F. Other additives can essentially break its properties and first of all effect of corrosion protection. Resulting corrosion damages can cause leak of a cooling liquid and to lead in a consequence to serious damages of the engine.

The additive to cooling liquid G12 + can be mixed with other additives (G11 and G12).

Fig. 1.167. A broad tank of system of cooling

Define visually level of a cooling liquid in a broad tank (fig. 1.167). At the cold engine level should be between labels min and max. At the heated-up engine level can slightly exceed a label

Authentically to check up level of a cooling liquid it is possible only at the idle engine.

About falling of level of a liquid the control lamp of the display of a combination of devices signals. Despite it, it is recommended to be checked from time to time.

Leak of a cooling liquid allows to assume, first of all, presence of thinnesses in cooling system. In this case urgently check up cooling system at the specialised enterprise.

At not broken tightness leak can arise only in case of boiling of a cooling liquid because of an overheat and its replacement from cooling system.

ATTENTION It is not supposed примешивание condensing means of a radiator to a cooling liquid. Gross infringement of function of system of cooling is possible.

Muffle the engine.

Allow to the engine to cool down.

Cover a stopper of a broad tank of system of cooling with a fabric and cautiously unscrew its rotation counter-clockwise.

Add cooling liquid.

Densely twirl a stopper.

For доливания use only a new cooling liquid.

The liquid is added only to a label "move". Surplus of a liquid at its heating is superseded from system through a safety valve in a stopper of a broad tank.

At considerable leak of a cooling liquid, it, in order to avoid engine damage, it is possible add only after it will cool down.

ATTENTION The cooling system is under pressure. Do not open a stopper of a broad tank of the hot engine – danger of a burn.

THE NOTE The merged cooling liquid do not use repeatedly. It should be утилизована taking into account environment preservation.

The fan of system of cooling can automatically join.

The fan drive is carried out through полиwedge a belt from the engine. The fan is equipped вязкостной муфтой, regulating frequency of its rotation depending on temperature.

Besides, depending on an engine or complete set variant (for example, automatic transmission, the tjagovo-drawbar, the conditioner) automatically joins additional электроdriving the fan. The fan works depending on temperature of a cooling liquid and temperature подкапотного spaces.

The additional fan can continue to work to 10 mines and after engine and ignition deenergizing. It can also automatically join after a while in following cases:

– The temperature owing to aerodynamic heating has raised or разогретое подкапотное the space in addition heats up bright solar beams.

ATTENTION At work in hood space it is necessary to remember probability of automatic inclusion of the fan.

Level of a brake liquid should be in a tank of a brake drive between labels MIN and "MOVE".

Insignificant decrease in level of a liquid in process of car run speaks deterioration and automatic adjustment of brake overlays. This normal phenomenon.

Fig. 1.168. A tank of a brake drive

At considerable decrease in level of a liquid for a short time interval or its falling below a label MIN depressurization of brake system is not excluded. About too low level of a brake liquid in a tank fire of a control lamp of brake system signals.

Replacement of a brake liquid should be carried out by the expert.

Brake liquid гигроскопична. Therefore eventually it absorbs a moisture from air and accumulates in itself water. The raised maintenance of water long time can cause corrosion damages of brake system. Besides, the boiling point considerably goes down and deterioration of brake effect is under certain conditions possible. Therefore replace a brake liquid each two years.

Owing to problems of recycling, necessity of the special tool and special knowledge it is recommended to carry out replacement of a brake liquid at enterprise Audi within the limits of inspection service.

Application only is authorised to an original brake liquid. The specialised enterprises are informed concerning the brake liquid authorised by concern Audi (specification DOT 4). Thus the brake liquid should be new.