The device, service, repair of Mercedes-Benz C of Class (W-203 c 2000г) - Removal and thermostat installation-//Mercedes Benz -

Mercedes C-Class

W203 since 2000 of release

Repair and car operation

+ Mercedes-Benz Cars of a class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
- Cooling and heating systems
   - Cooling system
      Antifreeze - means of protection from freezing
      Replacement of cooling liquid - general comments
      Removal and replacement of hoses of system of cooling
      Removal and thermostat installation
      Thermostat check
      Check of system of cooling under pressure
      Removal and installation of the pump of cooling liquid
      Removal and fan installation
      Removal and radiator installation
   + 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 thermostat installation

The pump of cooling liquid and the 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 — Bolt М8, 25Нм
6 — the Pump of cooling liquid
7 — Bolt М8, 25Нм
8 — the Bolt, 10Нм
9 — the Pulley
10 — Bolt М6, 10Нм
11 — the Bolt, 10Нм
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

The pump of cooling liquid and the thermostat. Diesel engines

1 — Bolt М6х28, 14Нм
2 — the Pulley
3 — the Ventilating hose
4 — the Pump of cooling liquid
5 — Sealing laying
6 — Krylchatka
7 — the Epiploon
8 — Laying
9 — Bolt М6х25, 9Нм
10 — the Sealing ring
11 — the Sensitive element of the sensor of temperature
12 — the Clip
13 — the thermostat Case, the thermostat (+92°С) 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 cover of the thermostat is shown. The thermostat is built in a cover and can be checked in a set.

Petrol engine



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. The cover should be removed only at temperature of cooling liquid below + 90°С.

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

2. Remove engine covers 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. Unscrew 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.



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

 Thus check a condition of hoses and collars, if necessary replace.

3. Establish forward and left covers of the engine.

Diesel engine

Differences from the petrol engine are described only.


1. Disunite the socket of a sensitive element of the sensor of temperature (14).
2. Disconnect the holder топливопровода from the thermostat case.
3. Disconnect hoses of cooling liquid and a hose of ventilation (1) at the thermostat (1) case.
4. Unscrew the thermostat (12) case. Inhaling moment 9Нм.