Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
- Cooling system
   Check of level of cooling liquid
   Frost resistance check
   Check of system of cooling on tightness
   Carving cover of a broad tank
   List of malfunctions
   Water pump
   Maple belt of the water pump
   Fan of system of cooling
   Malfunctions of the fan of system of cooling
   List of malfunctions
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Check of level of cooling liquid

Shooters in drawings showed the provision of marks a move and мin level of cooling liquid. At the left for 4-and 5-cylinder engines, on the right for the 6-cylinder engine.

Continuous check

Despite existence of the indicator of temperature of cooling liquid cooling liquid/level, you do not need to rely only on it, and from time to time to check liquid level in a broad tank in a motor compartment:

  • It is possible to measure level of cooling liquid precisely only at the idle engine
  • Liquid level in a transparent broad tank is well visible outside and at the closed cover. At the cold engine level should be between marks.
  • At the warmed-up engine level, naturally, rises a little.

Addition of cooling liquid

Appreciable loss of cooling liquid is a malfunction or breakage sign. Cooling liquid is not spent, and in the closed system of cooling it also cannot evaporate. A little cooling liquid it can be squeezed out to a cover only at an engine overheat.

At continuous loss of cooling liquid it is necessary to check cooling system on tightness according to the scheme described below in this chapter.

If the carving cover of a broad tank has to be opened at the hot engine, danger of a burn is great – therefore it is necessary to operate with care:

  • Hand in a glove or by means of a rag slowly to open a cover on one turn and to give the chance to an elevated pressure to leave system. Only after that completely to turn off a cover.
  • If to add only the distilled water, gradually you will dilute cooling liquid therefore whenever possible at once it is necessary to add a little concentrated nonfreezing liquid – antifreeze.
  • It is not necessary to add above «max» mark (see the previous section); cooling liquid extends when heating, and surplus evaporates from system.
  • You can add a small amount of liquid in a broad tank both at cold, and at the warmed-up engine.
  • At considerable loss of liquid and the hot engine it is impossible to add cold water in a broad tank. Because of «cold shock» the head of the block of cylinders can be deformed or burst the block of cylinders.

Cooling liquid

In system of cooling pure water, and a mix from the antifreeze including additives protecting from freezing and corrosion, and the distilled water circulates not. Therefore it is better to speak about cooling liquid or cooling means. The proportion of mixing makes for the European conditions 2:3, for the northern countries 1:1.

Protection against freezing to temperature
The 4-cylinder
– 25°C
– 35°C
4,2 l
3,5 l
2,8 l
3,5 l
The 5-cylinder
– 25°C
– 35°C
4,8 l
4,0 l
3,2 l
4,0 l
The 6-cylinder
– 25°C
– 35°C
4,4 l
5,5 l
6,6 l
5,5 l

Same important as protection against freezing, is protection against corrosion. It prevents emergence in system of cooling of a scum, a rust and other products of corrosion. Therefore the cooling means poured in a workshop with protection against corrosion does not need to be merged in the spring, and it is necessary to leave all the year round in cooling system. In masterful Audis own means of protection from «G 11 V8 B» freezing are applied. The manufacturer allows also application of other brands carrying designation «according to TL VW of 774 B».