Audi A4

Since 1994 of release

Repair and car operation



Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
- Cooling system
   So there is a cooling
   Check of level of a cooling liquid
   Antifreeze check
   Check of system of cooling on tightness
   Radiator
   Zapornaja cover of system of cooling
   The thermostat
   The help at malfunctions
   The water pump
   Klinovoj belt of the water pump
   Various models of fans
   The vjazkostnyj fan
   The fan of a radiator with the electric drive
   Infringements in work of the fan of a radiator
   The help at malfunctions
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics



The thermostat

Упрощенно speaking, the thermostat is intended to define, whether it is necessary to cool a liquid in a radiator or not, i.e. It «makes the decision» on, whether the cooling liquid on "small" or on "the big" circle about what it was already told in the beginning of the head should to circulate.

The thermostat regulates a stream of a cooling liquid depending on its temperature. While the temperature of a cooling liquid raises, the thermostat increases a stream of a cold liquid from a radiator. On the contrary, if the working temperature falls, the thermostat spring again wrings out клапанную a plate in position "is closed" (it. «Zu») and, thus, blocks inflow of the cooled down cooling liquid until the operational temperature again will not rise.