Audi A4, S4

Since 2000 of release

Repair and car operation

Audi A4, S4
+ Introduction
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
- Systems of cooling, heating and the air conditioner
   - Cooling system
      The general information
      Antifreeze - a protection frame from freezing
      Replacement of a cooling liquid
      Removal and thermostat installation
      Thermostat check
      Replacement of hoses of system of cooling
      Removal and radiator installation
      Removal and installation of the fan of a radiator
      Removal and installation of the pump of a cooling liquid
   + Systems of ventilation, heating and air conditioning
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of an electric equipment of the engine
+ Manual box of a gear change
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Removal and thermostat installation

The diesel engine of 1.9 l

At cars with the system of the cooling working under the set characteristic, the usual thermostat is absent.



  1. Merge cooling liquid.
  1. Disconnect the bottom hose of a cooling liquid from a connecting branch pipe (2). Preliminary open a collar and completely shift it back.
  1. Turn out bolts (1) and remove a connecting branch pipe with the thermostat (4).
  1. Turn the thermostat on 90 to the left and take out from a connecting branch pipe.



  1. Necessarily replace consolidations and sealing rings.
  2. Clear sealing surfaces.
  3. Insert the thermostat (4) with a new sealing ring (3) into a connecting branch pipe (2) and turn on 90 to the right.

Thermostat collars should stand almost vertically.

  1. Insert a connecting branch pipe with the thermostat into the block of cylinders and fix its moment 15Нм.
  2. Fill system with a cooling liquid, address to Section Check of the engine by means of the vacuum gauge.