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
   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

Infringements in work of the fan of a radiator

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

After the engine will a little cool down, it is possible to reach to the nearest 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 continuation of a trip because of traffic conditions probably only on low speed you should 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 crosspiece on a thermoswitch.

Malfunctions in вязкостном the fan

Vjazkostnoe coupling should be replaced, if:

  • At the idle engine the fan easily is not turned;
  • At the fan the big axial and radial palpation (the small backlash is admissible);
  • Silicone oil acts from вязкостного couplings.

Infringements in work вязкостного the fan


  1. In the beginning check up additional safety locks (the Electrotechnical equipment see the head).
  2. If they are perfectly in order, disconnect a thermoswitch socket.
  3. Перемкните both contacts in a socket of a wire a wire piece.
  4. Перемкните 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 crosspiece in a socket and it is reliable заизолируйте a sticky tape or a plaster in order to avoid short circuit.
  7. If перемыкание a thermoswitch has not helped, check up the fan relay in the central switching knot (the Electrotechnical equipment see the head). If both wires of a thermoswitch перемкнуты it should be audible as at ignition inclusion switching contacts in the relay become isolated.
  8. If it not so the time crosspiece in the relay becomes. For this purpose connect a piece of a wire contacts of a socket of the relay of plugs 30 and 87 (a writing paper clip) and insert the relay.
  9. The radiator fan should work even at the switched off ignition. If it so the relay is faulty.
  10. The crosspiece from a wire can be used as the time help on the journey. After a trip it needs to be removed.
  11. If success will not reach such way check up the fan engine:
  12. Disconnect a 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 a 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, the relay (the Electrotechnical equipment see the head), sockets of wires, and also all connections of a thermoswitch and the electrofan should be checked up.
  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.