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












Removal and installation of the thermostat

Pump of cooling liquid and thermostat. 4-cylinder petrol engine 111

1 — the Sealing ring of the case of the thermostat
2 — the Stopper
3 — the Sealing ring
4 — the Cover
5 — the Bolt of M8, 25 Nanometers
6 — the Pump of cooling liquid
7 — the Bolt of M8, 25 Nanometers
8 — the Bolt, 10 Nanometers
9 — the Pulley
10 — the Bolt of M6, 10 Nanometers
11 — the Bolt, 10 Nanometers
12 — a thermostat Cover
13 — the Thermostat
14 — the Sealing ring of a cover of the thermostat
15 — Sealing laying of the pump of cooling liquid
16 — the thermostat Case
17 — the Collar
18 — the Hose of cooling liquid
19 — Laying
20 — the Collar

Pump of cooling liquid and thermostat. Diesel engines

1 — the Bolt of M6x28, 14 Nanometers
2 — the Pulley
3 — the Ventilating hose
4 — the Pump of cooling liquid
5 — Sealing laying
6 — Krylchatka
7 — the Epiploon
8 — Laying
9 — the Bolt of M6x25, 9 Nanometers
10 — the Sealing ring
11 — the Sensitive element of the sensor of temperature
12 — the Clip
13 — the thermostat Case, the thermostat (+92 °C) is built in
14 — the Connecting element, between the case of the thermostat and the case of the mechanism of distribution

On illustrations the thermostat disconnected from a thermostat cover is shown. The thermostat is built in a cover and can be checked in a set.

Petrol engine

Removal

 PERFORMANCE ORDER

The thermostat is built in a cover of the thermostat and can be replaced only complete with it.


 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. Merge cooling liquid in capacity as it is described in the Section Replacement of Cooling Liquid - general comments.

2. Uncover the engine in front (2) and at the left (1).

3. Remove hoses of cooling liquid from a radiator and a broad tank on a thermostat cover. Previously release collars and displace them completely back.
4. Turn off a cover of the thermostat and remove it together with the thermostat.

The thermostat and cover of the thermostat form uniform knot. At removal the thermostat can be damaged and is not subject to the subsequent installation.

5. Remove laying of the case of the thermostat and clear sealing surfaces.

Installation

 PERFORMANCE ORDER

1. Establish a new sealing ring, a thermostat cover with the thermostat and fix by the moment 10 Nanometers.
2. Put on hoses of cooling liquid connecting unions and fix by collars.

 At the same time check a condition of hoses and collars, if necessary replace.

3. Establish forward and left covers of the engine.

Diesel engine

Only differences from the petrol engine are described.

 PERFORMANCE ORDER

1. Disunite the socket of a sensitive element of the sensor of temperature (14).
2. Disconnect the holder of a fuel-supply line from the thermostat case.
3. Disconnect hoses of cooling liquid and a hose of ventilation (1) at the case of the thermostat (1).
4. Unscrew the case of the thermostat (12). Moment of an inhaling of 9 Nanometers.