Mercedes C-Class

W203 since 2000 of release

Repair and operation of the car



Mercedes-Benz
+ 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






Check of the cooling system under pressure

Tools for check of the cooling system under pressure

4800-1 — the Manual pump
4800-2 — the Hose
4800-15 — the Nozzle

Check

 PERFORMANCE ORDER

Leakage in the cooling system and functioning of the safety valve in a cover can be checked by means of the measuring device which is available on sale. For this purpose the following HAZET tools approach: the manual pump 4800-1 with a hose 4800-2 and a nozzle 4800-15.

If sealing laying of a head of cylinders was replaced, before check warm up the engine up to the working temperature and let's it be cooled. At the same time tightness of laying of a head of cylinders is provided.

At the hot engine before opening of a broad tank cover it with a thick rag to exclude a burn owing to influence of hot cooling liquid and steam. It is necessary to uncover only at a temperature of cooling liquid below + 90 °C.

1. Turn on Ѕ a turn a cover on a broad tank to the left and dump pressure in the cooling system. Then turn a cover further and remove it completely.
2. Install the heater switch in salon on the maximum power.
3. Check the level of cooling liquid, if necessary add liquid, address appropriate section.

4. Install the device for check on the union for filling with liquid. By means of the pump of the device create pressure about 1.4 atm. If pressure falls, define the place of leak and eliminate leakage.

the illustration has informative character and cannot correspond to completely considered model.

5. If pressure falls, and there is no leak of liquid, the reason can be in internal leaks, for example, owing to damage of sealing laying of a head of cylinders or owing to existence of a crack in the case.


Check of the safety valve

 PERFORMANCE ORDER

The safety valve is located in a cover of a broad tank. Its task consists in opening of the cooling system and plum of liquid at achievement of a certain pressure.

1. Screw a cover (2) on the device for control (1).

the illustration has informative character and cannot correspond to completely considered model.

2. Create the necessary pressure specified in Specifications. The safety valve opens in two steps. The vacuum valve opens during depression creation.

On a cover pressure of opening of the valve is specified in atm. x 100. If, for example, on a cover costs "140/200", it is about a two-level cover and pressure of opening of the valve makes 1.4 and 2.0 atm.