Mercedes of the S-class W202
1993-2000 of release
Repair and operation of the car
+ 1.2. General information
+ 2. Maintenance
+ 3. Engines
+ 4. Lubrication system
- 5. Cooling system
+ 5.2. Cooling liquid
5.3. Antifreeze for a radiator
5.4. Temperature regulator of cooling liquid (thermostat)
5.5. Check of the cooling system
5.6. Hydraulic coupling of the fan
5.7. Pump of system of liquid cooling
5.9. Fan casing
5.10. Diagnostics of malfunctions of the cooling system
5.11. Diagnostics of malfunctions of system of indication of level of liquid
5.12. Engine overheat
+ 6. Heating, ventilation
+ 7. System of ignition
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electrical circuitries
By means of the standard control device it is possible to check leakage of the cooling system and functioning of the safety valve in a carving cover of the cooling system.
SAFETY VALVE OF EXCESSIVE PRESSURE
The safety valve is installed in a radiator cover. Its task – since a certain excessive pressure to open the cooling system and by that to create running off conditions in a compensation tank of excess amount of cooling liquid.
SENSOR OF INDICATION OF COOLING LIQUID (DIESEL ENGINE)
The system of indication of level of cooling liquid generally consists of the sensor in a compensation tank and a control bulb on the dashboard.
Indication of level of cooling liquid at the working engine warns about too low level of cooling liquid and, thanks to it, about a possible overheat of the engine. As soon as ignition joins, the control bulb shines within 30 seconds. At the working engine this bulb at once dies away.
Level of cooling liquid in a compensation tank is removed by means of a float (551). At the low level of cooling liquid in the sensor the contact (550) becomes isolated and the control bulb lights up. Depending on the mode of the movement a control bulb at first it is short-term, and later constantly flashes. If the control bulb flashes, add cooling liquid.