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

Violations in operation of the fan of a radiator

If the thermostat fails or the belt is torn maple (only at the four-cylinder engine), the idle fan of a radiator can lead to too considerable increase of temperature of cooling liquid.

After the engine will a little cool down, it is possible to reach to the next workshop on average turns and at smooth movement. Thus do not lose sight of the indicator of temperature and an alarm bulb.

On the contrary, idling and creeping speed are deadly to the engine. In these conditions through plates of a radiator does not pass cooling stream of fresh air. If trip continuation because of traffic conditions possibly only on low speed, you have to find out at once a cause of defect and in the presence of the fan with the electric drive if it is necessary, to put a crossing point on a thermoswitch.

Malfunctions in the vyazkostny fan

Coupling should be replaced by Vyazkostnoye, if:

  • at the idle engine the fan easily is not turned;
  • at the fan big axial and radial palpation (the small gap is admissible);
  • silicone oil acts from vyazkostny coupling.

Violations in operation of the vyazkostny fan


  1. In the beginning check additional safety locks (see head the Electrotechnical equipment).
  2. If they as it should be, disconnect the thermoswitch socket.
  3. To Peremknita both contacts in the wire socket a piece of a wire.
  4. To Peremknita all three sockets in a two-level thermoswitch.
  5. If now the fan at the included ignition works, (in this case empirically) the thermoswitch deduced from an electric chain – often meeting malfunction is faulty.
  6. To continue a trip, clamp a wire crossing point in the socket and it is reliable заизолируйте a sticky tape or a plaster in order to avoid short circuit.
  7. If the peremykaniye of a thermoswitch did not help, check the fan relay in the central switching knot (see head the Electrotechnical equipment). If both wires of a thermoswitch перемкнуты, have to be audible, as at inclusion of ignition switching contacts in the relay become isolated.
  8. If it not so, becomes a temporary crossing point in the relay. For this purpose connect a piece of a wire contacts of the socket of the relay of plugs 30 and 87 (a writing paper clip) and insert the relay.
  9. The fan of a radiator should work even at the switched-off ignition. If it so, is faulty the relay.
  10. The crossing point from a wire can be used as the temporary help on the way. After a trip it is necessary to remove it.
  11. If success will not reach such way, check the fan engine:
  12. Disconnect the wire socket to the engine of the fan and instead of it connect to contact of a red/black wire an auxiliary wire to the positive plug of the accumulator. Connection of the socket of a brown wire is connected directly to the negative plug.
  13. If the propeller still does not rotate, the fan engine is faulty – replace it.
  14. But if the fan works, relays (see head the Electrotechnical equipment), sockets of wires, and also all connections of a thermoswitch and the electrofan should be checked.
  15. You without cares can continue a trip also with the fan of a radiator receiving a food directly from the accumulator. The auxiliary wire should be isolated in order to avoid short circuit.