Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

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 the cooling system on tightness
   Carving cover of a broad tank
   List of malfunctions
   Water pump
   Maple belt of the water pump
   Cooling system fan
   Malfunctions of the fan of the cooling system
   List of malfunctions
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Frost resistance check

The special device – the areometer is necessary for you for check of frost resistance of cooling liquid. It measures the specific weight of liquid. Because of various means of protection from corrosion specific the weight of additives are not identical to protection against freezing. For safety it is worth taking away also the admission of 2 — 3 °C.


  1. To gather a little cooling liquid from a broad tank in the areometer.
  2. The areometer plunges on different depth depending on the specific weight of liquid.
  3. On a scale it is possible to see, up to what temperature protection against freezing is enough.
  4. Some of devices for determination of frost resistance are supplied with an arrow which specifies frost resistance degree.

In drawing it is shown how for determination of frost resistance concentration of cooling liquid is defined by the device.

Control of concentration of antifreeze

In most cases it appears that concentration of cooling liquid is already insufficient. Then it is necessary to add a little means from freezing; by rough calculations about 1/4 l on each 10 °C norms are lower.


  1. To remove the lower protection of a motor compartment (the head Elementy of a body).
  2. To substitute any capacity under the car.
  3. To open a drain stopper below on a radiator or to pick up the lower phone on a radiator, to lower 1 — 2 l of cooling liquid.
  4. Again to establish a tube or without pressing to tighten a stopper.
  5. To add the corresponding quantity of undiluted means from freezing and to add collected cooling liquid from capacity.