Mercedes S-class W202

1993-2000 of release

Repair and car operation

Mercedes W202
+ 1.2. The general data
+ 2. Maintenance service
+ 3. Engines
+ 4. Greasing system
- 5. Cooling system
   + 5.2. A cooling liquid
   5.3. Antifreeze for a radiator
   5.4. A temperature regulator of a cooling liquid (thermostat)
   5.5. Check of system of cooling
   5.6. Hydraulic муфта the fan
   5.7. The pump of system of liquid cooling
   5.8. A radiator
   5.9. A fan casing
   5.10. Diagnostics of malfunctions of system of cooling
   5.11. Diagnostics of malfunctions of system of indication of level of a liquid
   5.12. An engine overheat
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. A running gear
+ 11. A steering
+ 12. Brake system
+ 13. A body
+ 14. An electric equipment
+ 14.2. Electroschemes

5. Cooling system

5.1. A contour of circulation of a cooling liquid

THE GENERAL DATA

As soon as the engine was cooled, the cooling liquid circulates only in a head of the block of cylinders, and also in the block of cylinders of the engine and if the heating system, in the heat exchanger is opened. With increase in heating of the engine a regulator of a cooling liquid (thermostat) opens the big circulating contour of a cooling liquid. The cooling liquid goes through a radiator by means of pump of system of liquid cooling constantly finding in operation. The cooling liquid proceeds through a radiator from top to down and is thus cooled by means of air which blows in cooling edges.
For air exchange regulation in a radiator it is connected крыльчатка the fan, connected with hydraulic муфтой. At switching-off of this муфты the fan rotates according to frequency of rotation of a shaft of the engine, but not faster 1000 rpm. At temperature of a cooling liquid nearby 90 ° C the bimetallic plate includes hydraulic муфту thanks to what according to frequency of rotation of a shaft of the engine frequency of rotation of the fan increases. If frequency of rotation of the engine exceeds about 4500 rpm. (4000 rpm. At a diesel engine), the mufta-fan because silicone oil inside муфты becomes too hot is automatically disconnected. As soon as frequency of rotation of a shaft of the engine becomes more low about 4500 rpm. (4000 rpm. At a diesel engine), the fan again joins. Thanks to changeable work of the fan useful capacity of the engine raises and the fuel expense decreases.

The capacity of system of cooling at the 4-cylinder engine makes about 8,0 l, in the presence of the conditioner – about 9,0 l, and at the 6-cylinder engine about 10,0 l.

Capacity of system of cooling at the diesel engine in volume of 2 l about 8,0 l (nearby 9,0), at the engine in volume of 2,2 l about 7,0 l (nearby 7,5) and at the engine in volume of 2,5 l about 7,5 l. Values in brackets are valid for the vehicles equipped with the conditioner.