S-class W202 Mercedes

1993-2000 of release

Repair and car operation

W202 Mercedes
+ 1.2. General information
+ 2. Maintenance
+ 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 Principle of work of PMS Principle of work of 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 cooling liquid
      8.2.5. The sensor of soaked-up air
      8.2.6. System of vacuum pipelines
      8.2.7. The fuel distributor with klapanny nozzles
      8.2.8. Klapannye of a nozzle
      8.2.9. Oxygen sensor (lambda 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 the injector engine
      8.2.12. Turbo doctor
   + 8.3. System of injection and food of diesel engines
   + 8.4. System of production of exhaust gases
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes

b47c026d b47c026d

8.2.4. A temperature-sensitive element of cooling liquid


The temperature-sensitive element takes temperature of cooling liquid and transmits electric signals on the actuation device. The sensor is equipped with a NTC element (NTC – negative temperature factor) which reduces the resistance at increase in temperature. At malfunction of the sensor the actuation device chooses equivalent size which corresponds to temperature of cooling liquid at the engine which has been heated up 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 cooling liquid. For this purpose open a cover of a compensatory tank with cooling liquid.
2. Remove a protective casing (5/3) from the thermostat case.
3. Remove the shtekkerny socket and unscrew a temperature-sensitive element (B11/3).


1. Suspend a temperature-sensitive element in a water bath and slowly heat up it.
2. Check 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 of 20 N of m.
2. Get the shtekkerny socket of a wire.
3. Warm up the engine and check tightness of connections. Once again check level of 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