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
+ 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
   Heating and ventilation check
   Heater fan
   Replacement of the dustproof filter
   Heating and ventilation drive
   List of malfunctions
+ body Elements
+ Search of malfunctions
+ Specifications

Heater fan

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

The engine of the fan has four speeds which are established by regulator turn «Access of air and the fan» 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 a wire conducting on the case ("weight"), to the fan engine. Current giving (through a safety lock), thus, remains to a constant – contact on "weight" "improves" or "worsens" only.

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 head Body electrosystem).
  2. If, despite a serviceable safety lock, screen wipers do not work also, means, the reason in the unloading relay of contact X (see head Body electrosystem).
  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 tip 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-dark 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 should work with the maximum speed. Otherwise to replace.
  6. If the fan works not on all speeds, that, one of resistance is possible, faulty.
  7. To remove additional resistance, to carry out visual check. 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 a heating drive.

Removal of the engine of the fan of salon

The engine of the fan of salon отбалансирован together with a krylchatka therefore replacement of only 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 line.
  3. To press a screw-driver a fixing uvula on the brink of the case, to turn the fan case in an air line to the right (clockwise) and to take out it.
  4. To get from an air line the jammed garbage.

Removal of resistors


  1. To remove a ware box (section Salon).
  2. To turn out screws with a 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 line really densely.