Mercedes of the S-class W202

1993-2000 of release

Repair and operation of the car



Mercedes W202
+ 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
   5.8. Radiator
   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






5.10. Diagnostics of malfunctions of the cooling system

GENERAL INFORMATION

REASON
WAY OF ELIMINATION
Too high temperature of cooling liquid, indication is in red area of a scale
Too little cooling liquid in a circulation contour The compensation tank has to be filled in to a mark, see subsection 5.2., check tightness of the cooling system.
The regulator of supply of cooling liquid is not open (thermostat) Check whether the top hose with cooling liquid on a radiator heats up. If is not present, remove and check the regulator, if necessary, replace.
The pump of system of liquid cooling is faulty Sort and check the pump.
The sensor of indication of temperature of cooling liquid is faulty In addition check the sensor.
The system of indication of temperature of cooling liquid is faulty Check the indicator device.
The carving cover of a radiator is faulty Check the cooling system, carry out hydraulic test of a carving cover.
Radiator plastnka are polluted Remove a radiator and blow it compressed air from the engine.
The radiator is intoxicated limy deposits and products of corrosion inside. The radiator heats up only in the top part, the lower hose of a radiator with cooling liquid does not heat up Replace a radiator.
The fan of a radiator rotates not according to increase in frequency of rotation of a shaft of the engine, the bimetallic plate of the hydraulic coupling of the fan of the cooling system is faulty At a temperature of cooling liquid about 90-95 °C leave to work the engine with the frequency of rotation of a shaft of the engine of 4000-4500 rpm., at the same time the frequency of rotation of a shaft of the fan has to increase accurately. Otherwise check the hydraulic coupling of the fan of the cooling system, if necessary replace a bimetallic platinka.