Audi A4

since 1994 of release

Repair and car operation

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

Vyazkostny fan

Here you see the vyazkostny fan (the radiator fan) six-cylinder engine. Its knots:

1–fan blade;
2–an axis of vyazkostny coupling – at the six-cylinder engine with a big fixing bolt with a six-sided head;

3–vyazkostny coupling.

For economy of capacity this fan is supplied with so-called vyazkostny coupling. It turns on the fan at ambient temperature of 82 °C. It is carried out by means of a bimetallic tape which, being temperature and dependent, via the valve lets in viscous silicone oil working space of vyazkostny coupling. Oil creates power short circuit between a belt pulley and the fan – the fan submits cool air. At temperature below 60 °C silicone oil comes back from working space to a collector – the fan rotates with smaller speed, without spending capacity.

Dismantle of the vyazkostny fan

Dismantle of the vyazkostny fan of the six-cylinder engine: to weaken a fixing bolt of the fan, it is necessary to block a belt pulley: into an opening (2) to insert a screw-driver and to rest against an arm (1).

The same process which is described in the dismantled engine at the left, here is shown in the car. The screw-driver is inserted into an opening (2) and rests against an arm (1). It is possible to unscrew a bolt (3).

Dismantle of the vyazkostny fan at the four-cylinder engine: the belt pulley (1) is blocked by bolt М5 X 60 (2), a fixing bolt it is possible to unscrew a natural internal shestigranniky 8 mm (3).


  1. Four-cylinder engine: unscrew a key behind in the fan bearing a fixing bolt with an internal shestigrannik
    in 8 mm. A belt pulley block, having inserted bolt М5 X 60.
  2. Remove the vyazkostny fan.
  3. Unscrew from the fan its coupling.
  4. At installation tighten a bolt on 70 Nanometers.
  5. The moment of an inhaling of the fan at coupling: 10 Nanometers.
  6. Six-cylinder engine: weaken a fixing bolt of the fan (it at the same time is a fan axis) a rozhkovy key of SW 32.

     Attention: left carving! Block thus a belt pulley a screw-driver. The screw-driver rests against the arm provided for this purpose.

  7. Remove the vyazkostny fan.
  8. Unscrew on the fan vyazkostny coupling.
  9. At installation tighten a bolt on 70 Nanometers.
  10. The moment of an inhaling of the fan on coupling: 10 Nanometers.