Audi A4, S4

since 2000 release

Repair and operation of the car

Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
+ Engine
- Cooling systems, heating and air conditioner
   - Cooling system
      General information
      Antifreeze - a security measure from freezing
      Replacement of cooling liquid
      Removal and installation of the thermostat
      Check of the thermostat
      Replacement of hoses of the cooling system
      Removal and installation of a radiator
      Removal and installation of the fan of a radiator
      Removal and installation of the pump of cooling liquid
   + Systems of ventilation, heating and air conditioning
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Replacement of hoses of the cooling system

Observe the precautionary measures specified in the Section Check of a State and Replacement of Hoses of a Motive Compartment, localization of leaks.


  1. If as a result of the inspection which is carried out according to the recommendations provided in the Head the Current leaving and service you found damages on any hose, it needs to be replaced.
  2. Merge liquid from the cooling system (address to the Head the Current leaving and service). If you are not going to fill in new liquid in system, keep merged for the subsequent use.
  3. Flat-nose pliers squeeze short moustaches of regular collars (or a screw-driver weaken screws of collars of screw type — if are established). Take collars aside. Accurately remove a hose from branch pipes. To remove new hoses much more simply than the old.
  4. If the hose is not removed from a branch pipe, try to rotate it. Do not damage branch pipes, trying to remove a hose. Breakage can lead to expensive repair. Keep in mind that radiator branch pipes quite fragile therefore at removal of hoses from them do not use the big efforts. If the hose all the same is not removed, cut off it, then cut the piece which remained on a branch pipe lengthways and remove. The cost of a new hose is incomparable to the cost of a new radiator. Before cutting a hose, be convinced that will be able to buy the new.
  5. At installation of a new hose at first put on it collars then establish a hose on branch pipes. If collars of coupling type initially were established, replace them with the screw. For simplification of installation of rigid hoses moisten internal surfaces of their ends with soap water or heat in hot water (do not lower a hose in the boiling water — it can be stratified).
  6. After installation of a hose check correctness of its laying in a motive compartment for branch pipes. Establish collars for the ends of a hose, having brought them for flaring of branch pipes, and tighten them.
  7. Fill the cooling system (address to the Head the Current leaving and service).
  8. Start the engine and make sure of lack of leak of cooling liquid from the served knot.