Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
- Heating and ventilation
   Check of heating and ventilation
   Heater fan
   Replacement of the dustproof filter
   Drive of heating and ventilation
   List of malfunctions
+ body Elements
+ Search of malfunctions
+ Specifications

Heater fan

If the ware box is open or removed, there is available an engine of the fan (4). It is inserted from below into an air duct (1). Resistors and a thermoswitch (3) on an illustration are removed together with the plug (2). At installation to watch that the block of resistance did not break tightness of an air duct. If necessary to apply sealant.

The engine of the fan has four speeds which are established by turn of the "Access of Air and Fan" regulator on the dashboard. Speed of the fan changes by connection of resistors with various resistance (or by their inclusion of one behind another). Resistance are connected to the wire conducting on the case ("weight") to the fan engine. Giving of current (through a safety lock), thus, remains to a constant – only contact on "weight" "improves" or "worsens".

Search of malfunctions of the engine of the fan


  1. If the fan does not work at any position of the switch, at first you should check the corresponding safety lock (tables in the head the Body electrical system).
  2. If, despite a serviceable safety lock, also screen wipers, so the reason in the unloading relay of contact of X do not work (see the head the Body electrical system).
  3. Check of the engine of the fan: to open a ware box, slightly to pull down lock latches of a box and to lift over edge of the dashboard. Thereby it is possible to cast away a box completely.
  4. To disconnect the bipolar plug from the fan engine, to lay auxiliary wires to two released connecting contacts: from a positive conclusion of the accumulator to contact where there was a black-blue wire, from a negative conclusion of the accumulator to contact where there was a brown-red wire.
  5. If the engine of the fan is serviceable, it has to work with the maximum speed. Otherwise to replace.
  6. If the fan works not at all speeds, that, is possible, faulty one of resistance.
  7. To remove additional resistance, to carry out a visual inspection. In case one of resistance fused, it is necessary to replace all block of resistors.
  8. If additional resistance as it should be, along with a rupture of conducting the rotary regulator on the dashboard can appear a cause of defect – completely to replace the heating drive.

Removal of the engine of the fan of salon

The engine of the fan of salon is balanced together with a krylchatka therefore replacement only of both parts in a set is possible.


  1. Completely to remove a ware box.
  2. The engine of the fan of salon is inserted from below into a heater air duct.
  3. To press a screw-driver a fixing uvula on the edge of the case, to turn the fan case in an air duct to the right (clockwise) and to take out it.
  4. To get the jammed garbage from an air duct.

Removal of resistors


  1. To remove a ware box (section Salon).
  2. To turn out screws with crosswise shliyets under a framework of resistors (where are available).
  3. To wring out down a fixing bracket and to extend a framework down.
  4. At installation to watch that the framework sat in an air duct really densely.