Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
- Cooling system
   Check of level of cooling liquid
   Frost resistance check
   Check of system of cooling on tightness
   Carving cover of a broad tank
   List of malfunctions
   Water pump
   Maple belt of the water pump
   Fan of system of cooling
   Malfunctions of the fan of system of cooling
   List of malfunctions
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Malfunctions of the fan of system of cooling

Except the jammed thermostat and the torn maple belt, the faulty fan of system of cooling, however only at long work on single turns can become the reason of too high temperature of cooling liquid. But the faulty fan should not mean the trip end:

  • After the engine cooled down, it is possible to go to the next workshop on average turns and at rather fast speed. Thus it is necessary to watch the indicator of temperature and a control bulb.
  • Operation of the engine on single turns and slow driving can appear for the engine deadly. Thus through a radiator practically does not pass cooling air. If it is necessary to go further on low speed, it is better to begin immediately searches of the reasons of malfunctions and if necessary to "bypass" a thermoswitch.

Search of malfunctions

Illustrations show a thermoswitch of function of turning on of the fan of system of cooling after engine termination of work, at the left at the 4-cylinder engine, on the right at the 5-cylinder.


  1. For a start it is necessary to check the corresponding safety lock in the additional block of the relay at the left under a control panel. (head Body electrosystem).
  2. If it as it should be, separate the thermoswitch tip.
  3. Connect both contacts in a wire tip a wire slice.
  4. At the two-level thermostat it is necessary to connect all three shtekerny uvulas.
  5. If the fan at the included ignition starts to work, it means that the thermoswitch excluded from an electric chain (on test) is faulty.
  6. For further movement it is necessary to fix well a wire in tips and заизолировать its sticky tape or a plaster in order to avoid short circuit.
  7. If the detachment of a thermoswitch did not lead to success, check the fan relay in the central switchboard (see head Body electrosystem): if both crossing points of a thermoswitch "are bypassed", at the included ignition contacts in the relay should is distinctly heard to become isolated.
  8. If it is audible nothing, it is necessary to "bypass" the relay supportive applications. For this purpose to connect uvulas of the tip of the relay of plugs 30 and 87 a wire slice (a writing paper clip) and to insert the relay.
  9. The fan of system of cooling should earn now and at the switched-off ignition. If it occurred, means, the relay is faulty.
  10. The wire crossing point can remain in an extreme case established and at movement. After end of a trip it is necessary to remove it.
  11. If and in this case did not follow any reaction, check the fan motor:
  12. To disconnect a wire tip at the engine of the fan and to lay instead from contact of a red-black wire an auxiliary wire to a positive conclusion of the accumulator. Shtekernoye needs to be connected connection of a brown wire directly to a negative conclusion.
  13. If the krylchatka still does not rotate, means, the fan engine is faulty – it is necessary to replace.
  14. If the fan earned, it is necessary to check the relay (see head Body electrosystem), tips of wires, and also all cable connections from a thermoswitch and the fan.
  15. You can continue bravely movement even with the fan, zapitanny is direct from the storage battery. It is necessary to lay auxiliary conducting so that there was no short circuit.
  16. In the models equipped as appropriate the second step of the fan or the device for turning on of the fan after termination of work of the engine receives a food through a red-dark blue wire. For check of this step of the fan connect «+» a wire to a red-dark blue wire of shtekerny contact of the engine.

Removal of the fan of system of cooling

The fan of system of cooling is necessary for removing from a radiator together with a back protective casing of a radiator – so-called tsargy the fan:


  1. Models with 4-cylinder engines: to turn out fixing bolts above on царге the fan.
  2. To separate the tip from the engine of the fan and to disconnect a plait of wires.
  3. To extend царгу from arms at bottom edge.
  4. Models with 5-cylinder engines: to remove a broad tank with cooling liquid. Hoses remain connected.
  5. To weaken four fixing bolts on царге.
  6. To disconnect tips on the fan engine.
  7. To take out царгу together with the fan engine.
  8. Models with 6-cylinder engines: removal is made as at the 4-cylinder engine, however wires to fan engines below on the left longeron should be disconnected from "weight" or from a rezistorny payment.
  9. For this purpose to remove the bottom protection of a motor compartment (head body Elements).
  10. All models: for separation of the engine and царги to weaken three fixing nuts.