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
   + 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







Cooling system and heating

 Separate characteristics are provided also in the text of the Head and in case of obligation of their performance are highlighted in bold type.

Design

Thermosiphon with the bladed water pump. Thermostatic adjustment. With a separate broad tank. The fan with the electric drive, joins and switched off from the control unit

Cooling liquid: mix of soft water and antifreeze (1:1), at such structure is provided frost resistance to –37 °C

Antifreeze

MB No. Q1 03 0002 or Glysantin Protect Plus/G482

System volume during the replacing, l

  • Petrol engines with designation 111
8.5
  • Petrol engines with designation 271
7.5
  • Petrol engines with designation 112
10.5
  • Diesel engines with designation 611
11.9
  • Diesel engines with designation 6212
12.4
Composition of cooling liquid

Antifreeze share in cooling liquid for ensuring frost resistance

to -37 °C

50%

to -45 °C

55%

Pressure in system

About 1.2 atm. (the exact size is specified on a cover of a broad tank). The cover has to maintain pressure within two minutes.

Thermostat

Valve stroke

not less than 8 mm

Petrol engines

  • Beginning of opening
87±2 °C
  • Full opening
102 °

Diesel engines

  • Beginning of opening
92 ° ±2 °C
  • Full opening
102 °

Fan thermoswitch

Inclusion/switching off of the 1st step

92-97/84-91 °C

Inclusion/switching off of the 2nd step

99-105/91-98 °C

Stopper of a broad tank

The valve of excessive pressure opens, atm.

Step 1

1.4 ± 0.1

Step 2

2.0 ± 0.1

The valve of depression opens

0.1

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.

Conditioner coolant

Type

R134a (do not use R12)

Volume, гр.

750

Refrigerator oil

Type

A001 989 0803

Volume, cm3

120

Efforts of tightening of threaded connections, Nanometer

The moments of an inhaling of fixture are given also in the text of the Head and on some illyustratsiyakh*.

* The moments of an inhaling highlighted in the text in bold type are subject to exact observance; the efforts which are not highlighted in bold type are given only approximately.

Stopper of cooling liquid on the block of cylinders

  • Petrol engines 111
40
  • Petrol engines 112
12
  • Diesel engines
30

Bolts of fastening of the water pump

4-cylinder petrol engines

  • M6 bolt
10
  • M8 bolt
25

6-cylinder petrol engines

  • M6 bolt
14
  • M8 bolt
35 (at the new case of the mechanism of distribution of 10 Nanometers and 25 Nanometers respectively)

Belt damper

  • to the tension device
25
  • to the pump of cooling liquid
35

Diesel engines

  • M6 bolt
14
  • M8 bolt
20

Pulley to the pump of cooling liquid

35
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