Mercedes S-Class W-140

1991-1999 of release

Repair and operation of the car

Mercedes S-Class
+ Mercedes-Benz cars of the class S (W-140)
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling systems, heating
   - Engine cooling system
      Replacement of cooling liquid - general comments
      Removal and replacement of hoses of the cooling system
      Check of the thermostat
      Removal and installation of the thermostat
      Removal and installation of a radiator of the cooling system - an installation detail
      Removal and installation of the water pump
   + Systems of ventilation, heating and air conditioning
+ Power supply system and release
+ Engine electric equipment
+ Gear shifting box
+ Automatic transmission
+ Coupling
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


Removal and replacement of hoses of the cooling system

See also Section Check of a State and Replacement of Hoses of a Motive Compartment, localization of leaks in the Head Routine maintenance


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 (see the Section Check of Functioning of the Cooling System and Frost Resistance of Cooling Liquid, replacement of liquid in 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.