Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
- Cooling system
   Check of level of a cooling liquid
   Frost resistance check
   Check of system of cooling on tightness
   Carving cover of a broad tank
   The thermostat
   The list of malfunctions
   The water pump
   Klinovoj belt of the water pump
   The fan of system of cooling
   Malfunctions of the fan of system of cooling
   The list of malfunctions
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications


Frost resistance check

The special device is necessary for check of frost resistance of a cooling liquid – ареометр for you. It measures relative density of a liquid. Because of various protection frames from corrosion specific weight of additives for protection against freezing неодинаковы. For safety it is necessary to take away also the admission 2—3С.


    To type a little a cooling liquid from a broad tank in ареометр. Ареометр plunges on different depth depending on relative density of a liquid. On a scale it is possible to see, to what temperature protection against freezing suffices. Some of devices for frost resistance definition are supplied by an arrow which specifies frost resistance degree.

In drawing it is shown, how the device for frost resistance definition defines concentration of a cooling liquid.

The control of concentration of antifreeze

In most cases it appears that concentration of a cooling liquid is already insufficient. Then it is necessary to add a few means from freezing; by rough calculations about 1/4 l on everyone 10С below norm.


    To remove the bottom protection of a motor compartment (the head body Elements). To substitute under the car any capacity. To open a drain stopper below on a radiator or to remove the bottom tube on a radiator, to lower 1—2 l of a cooling liquid. Again to establish a tube or without pressing to tighten a stopper. To add corresponding quantity of not diluted means from freezing and to add the collected cooling liquid from capacity.