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
+ Signaling 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

Drive of heating and ventilation

All functions of system of heating and ventilation of salon in the Audi 80 car can be operated from the block located on the dashboard.

Three so-called cables of Bowden pass to the air duct case which is often called by "an air duct box" from there. In this case the air valves directing an air stream in the necessary direction are located.

Sleva: the rotary regulator (2) fans of salon is rigidly connected with the control unit and the drive of system of heating and ventilation (1). At malfunction it is necessary to replace all knot completely.

On the right: removal of a cable of Bowden at the block of the drive of system of heating and ventilation of salon: to pull out pincers a countersupport (1), to disconnect the end of a cable (2) from the lever (3).

Replacement of hummock drives


  1. Removal and installation are identical practically at all hummock drives.
  2. To remove a shelf at the left under the dashboard (section Salon).
  3. To remove radio.
  4. If necessary to remove a ware box.
  5. To remove all three handles of rotary switches of heating/ventilation.
  6. To weaken two screws with crosswise shliyets located below.
  7. To remove the panel.
  8. To turn out visible now four bolts with cross-shaped shliyets.
  9. Now it is possible to extend a little from the dashboard the control unit of heating and ventilation of salon, so, to reach fastenings of cables of Bowden.
  10. By means of the screw-driver to wring out a drive cable countersupport from a latch on the drive block.
  11. The end of a cable is bent in the form of a loop and leaky inserted into the drive lever.
  12. On a box of an air duct of a cover of cables of Bowden are rigidly screwed on eyes or are recorded by plastic latches.
  13. To turn out screws or to squeeze latches and to remove clips.

Removal of ventilating grates

If for rotary guides of air in the ventilating channel the leaf was hooked:


  1. To hook a ventilating grate the screw-driver above and below and to carefully take out it.
  2. At installation to pay attention: the top rotary hinge is thicker.