Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car

+ Mercedes-Benz cars of class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling system and heating
   - Cooling system
      Antifreeze - a security measure from freezing
      Replacement of cooling liquid - general comments
      Removal and replacement of hoses of the cooling system
      Removal and installation of the thermostat
      Check of the thermostat
      Check of the cooling system under pressure
      Removal and installation of the pump of cooling liquid
      Removal and installation of the fan
      Removal and installation of a radiator
   + Systems of ventilation, heating and air conditioning
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Removal and 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 Routine maintenance you found damages on any hose, it needs to be replaced.
2. Merge liquid from the cooling system (address the Head Routine maintenance). 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 the 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 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 great 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 you will be able to buy 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 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 the Head Routine maintenance).
8. Start the engine and make sure of lack of leak of cooling liquid from the served knot.