Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
- Cooling system
   So there is a cooling
   Check of level of cooling liquid
   Antifreeze check
   Check of the cooling system on tightness
   Locking cover of the cooling system
   The help at malfunctions
   Water pump
   Maple belt of the water pump
   Various models of fans
   Viscous fan
   The radiator fan with the electric drive
   Violations in operation of the fan of a radiator
   The help at malfunctions
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

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

The thermostat regulates a stream of cooling liquid depending on its temperature. While temperature of cooling liquid increases, the thermostat increases a stream of cold liquid from a radiator. On the contrary, if working temperature falls, the thermostat spring again wrings out a valvate plate in situation "Zu" "is closed" (German) and, thus, blocks inflow of the cooled-down cooling liquid until operational temperature again does not rise.