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
+ 6. Heating, ventilation
+ 7. Ignition system
- 8. Fuel system
   + 8.1.1. Introduction
   - 8.2. System of injection of petrol engines A principle of work PMS A principle of work HFM
      8.2.2. Self-diagnosing of a condition of system of ignition and fuel injection
      8.2.3. Air flowmeter
      8.2.4. A temperature-sensitive element of a cooling liquid
      8.2.5. The gauge of soaked up air
      8.2.6. System of vacuum pipelines
      8.2.7. The fuel distributor with клапанными atomizers
      8.2.8. Klapannye atomizers
      8.2.9. The oxygen gauge (ljambda-probe)
      8.2.10. Diagnostics of malfunctions of system of injection of gasoline
      8.2.11. That it is necessary to know to the owner of the car with инжекторным the engine
      8.2.12. The Turbo-doctor
   + 8.3. System of injection and a food of diesel engines
   + 8.4. System of release of the fulfilled gases
+ 9. Transmission
+ 10. A running gear
+ 11. A steering
+ 12. Brake system
+ 13. A body
+ 14. An electric equipment
+ 14.2. Electroschemes

8.2.4. A temperature-sensitive element of a cooling liquid

The temperature-sensitive element takes temperature of a cooling liquid and transmits electric signals on the actuation device. The gauge is equipped by a NTC-element (NTC – negative temperature factor) which reduces the resistance at temperature increase. At malfunction of the gauge the actuation device chooses equivalent size which corresponds to temperature of a cooling liquid at the engine, нагретого to working temperature. At low external temperatures and the cold engine it conducts to difficulties at start-up of the engine and to its work out of modes.

The temperature-sensitive element is in the thermostat case.


1. Reduce pressure in a contour of a cooling liquid. For this purpose open a cover of a compensatory tank with a cooling liquid.
2. Remove a protective casing (5/3) from the thermostat case.
3. Remove штеккерный a socket and unscrew a temperature-sensitive element (В11/3).


1. Suspend a temperature-sensitive element in a water bath and slowly heat up it.
2. Check up an ohmmeter resistance of a temperature-sensitive element. The measured value is considered normal if it is in the admission of 5 % (see the table Resistance of a temperature-sensitive element).
3. If at measurements the temperature-sensitive element does not reach preset values, it is necessary to replace it.


1. Screw in a temperature-sensitive element with a new sealing ring and tighten with the moment 20 Н.м.
2. Spread штеккерный a wire socket.
3. Warm up the engine and check up tightness of connections. Once again check up level of a cooling liquid.

Resistance of a temperature-sensitive element

+20 WITH
Apprx. 2500 Ohm
+30 WITH
Apprx. 1700 Ohm
+40 WITH
Apprx. 1170 Ohm
+50 WITH
Apprx. 830 Ohm
+60 WITH
Apprx. 600 Ohm
+70 WITH
Apprx. 435 Ohm
+80 WITH
Apprx. 325 Ohm
+90 WITH
Apprx. 245 Ohm
+100 WITH
Apprx. 185 Ohm