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 help at malfunctions
The thermostat
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Signs
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The reason/consequence
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A.Temperatura rises slowly, the operational temperature is reached later, insufficient effect on - грева |
The klapannaja plate of the thermostat is blocked in position "openly" (it. Оffen) (for example, because of a deposit); the liquid stream to a radiator is constantly opened. The engine too long works in not heated-up condition. But for the small period of time it does not put harm. Despite it, change the thermostat somewhat quicker. |
| B. The arrow of the indicator of temperature is rejected to the right to a limit, despite correct level of a cooling liquid, the control bulb of a cooling liquid blinks. A radiator and the bottom hose going to a radiator, cold. | The klapannaja plate of the thermostat is blocked in position "is closed" (it. Geschlossen) (for example, because of a defective or not tight box of the thermostat). At all do not continue a trip, differently there will be heavy thermal damages of the engine! At once replace the thermostat. |
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Council: If on the journey the engine begins to boil because of the defective thermostat, towage or full dismantle of the thermostat on a place will help only. If you have made decision to dismantle the thermostat in the beginning should wait, the temperature of a cooling liquid will not go down yet. |
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The four-cylinder engine: here the internal device of the water pump and the thermostat (in a cut) is shown. It is well visible лопастное a wheel (1) water pumps. Nearby there is a thermostat (2). |
On the right: at the six-cylinder engine the case of the thermostat (marksman) is on the right ahead at the engine block.
At the left: in drawing assembly position of the thermostat is shown at the four-cylinder engine. The air valve (arrow) should be turned upwards.
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Thermostat dismantle
The jammed thermostat is very difficult for dismantling on the journey. It is located far enough below, therefore it is necessary to merge almost all cooling liquid. Besides at the hot engine will pass a lot of time before you can begin work, without being afraid thus to burn hands. At installation of the new thermostat it is necessary to replace also a sealing ring on the case of the thermostat and the water pump.
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PERFORMANCE ORDER |
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Thermostat check
By means of the built in thermometer you can check, whether the thermostat opens at the set temperature.
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The opening beginning
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The opening end
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Minute an opening course
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Nearby 87 С
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Nearby 102 С
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About 8 mines
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PERFORMANCE ORDER |
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