Audi A4, S4
Introduction
Controls and receptions of safe operation
Current leaving and service
The engine
- Systems of cooling, heating and the air conditioner
   - Cooling system
      The general information
      Antifreeze - a protection frame from freezing
      Replacement of a cooling liquid
      Removal and thermostat installation
      Thermostat check
      Replacement of hoses of system of cooling
      Removal and radiator installation
      Removal and installation of the fan of a radiator
      Removal and installation of the pump of a cooling liquid
    Systems of ventilation, heating and air conditioning
Power supply systems, release and decrease in toxicity of the fulfilled gases
Systems of an electric equipment of the engine
Manual box of a gear change
Automatic transmission
Coupling, power shafts and differential
Brake system
Suspension bracket and steering
Body
Onboard electric equipment




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Antifreeze - a protection frame from freezing

Cooling liquid

The cooling system is all-the-year-round filled with a mix of water, antifreeze and anticorrosive means. It interferes with a rust and corrosion, adjournment of salts and, besides, raises temperature of boiling of a cooling liquid. In system of cooling because of liquid expansion at heating superfluous pressure is created that also conducts to rise in temperature of boiling of a cooling liquid. Pressure is limited located in a cover of a broad tank to the valve which opens at pressure 1.4 – 2.0 атм. For faultless functioning of system of cooling it is required to be insured from boiling of a cooling liquid at which the steam stopper therefore liquid circulation decreases also engine cooling can be formed worsens. The boiling temperature should be raised. For this purpose the cooling system always should be filled with a mix of water and the listed additives to it.