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
   + 5.2. Cooling liquid
   5.3. Antifreeze for a radiator
   5.4. A temperature regulator cooling liquids (thermostat)
   5.5. Check of system of cooling
   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 system of cooling
   5.11. Diagnostics of malfunctions of system of indication of level of liquid
   5.12. Engine overheat
+ 6. Heating, ventilation
+ 7. Ignition system
+ 8. Fuel system
+ 9. Transmission
+ 10. Running gear
+ 11. Steering
+ 12. Brake system
+ 13. Body
+ 14. Electric equipment
+ 14.2. Electroschemes








b47c026d b47c026d


5.4. A temperature regulator cooling liquids (thermostat)

GENERAL INFORMATION

Prevention

If the engine heats up after passing by the car of a small piece of a way, it can be caused by that a radiator зашлаковывается limy deposits.


With increase in warming up of the engine the thermostat opens a big contour of circulation of cooling liquid. If the thermostat of cooling liquid is closed because of malfunction, the engine becomes too hot. It is possible to determine it by indication of temperature of cooling liquid which is in a red range while at the same time the radiator remains cold. But the faulty thermostat even after cooling of cooling liquid can remain and further open. It is visible on that fact that the engine any more does not reach the working temperature, or the arrow of indication of temperature of cooling liquid moves up more slowly, than before, or the capacity spent for heating in the winter decreases.

Check



PERFORMANCE ORDER
1. Remove a regulator of a termostatirovaniye of cooling liquid.
2. Measure thermostat height, write down the size "a".
3. Slowly heat up the thermostat on a water bath. Thus it should not adjoin to vessel walls, and is completely shipped in water. Temperature supervise the suitable thermometer. At temperature about 87 ° With a bimetallic plate of a regulator it starts to be extended, reaching the maximum lengthening at temperature about 102 ° C. As soon as water of a bath will reach opening temperature, the regulating zaslonka of the thermostat should start to open.
4. Heat up water in a bath to its boiling. Take the thermostat, measure height (size "b") and compare to the first measured size (size "a"). At the end of opening the height of lifting of opening makes about 8 mm. As this temperature is not reached, check, whether the regulator till the compared size opened, otherwise replace it.
5. In summary check, whether the regulator completely is again closed when cooling, otherwise replace a regulator.
6. At the wrong functioning replace the thermostat.
7. Establish the thermostat into place.

4-CYLINDER PETROL ENGINE

1. Bolt
2. A hose of cooling liquid
3. A hose of cooling liquid
27. A cover of the case of a temperature regulator of cooling liquid
27а. A temperature regulator of cooling liquid
29. Sealing ring
30. Consolidation

Removal

PERFORMANCE ORDER
1. Disconnect a weight wire (–) from the accumulator.
Prevention

The anticreeping code of radio is thus erased.


2. Merge cooling liquid in a suitable vessel.
3. Remove a forward plastic cover.
4. Remove from a cover of the thermostat both of a hose of cooling liquid, previously unclench collars and shift them back.
5. Turn off bolts from a thermostat cover.
6. Uncover the thermostat together with the thermostat.
Prevention

It is impossible to separate the thermostat from a cover, differently it will be damaged and cannot be repeatedly established.


7. Check the thermostat.

Installation

PERFORMANCE ORDER
1. Get a cover together with the thermostat and a new sealing ring and screw up it with the moment of 10 N of m. In advance clear sealing surfaces on the case and a cover.
2. Get a hose for production of air and a hose for cooling liquid and fix them clips.
3. Fill in cooling liquid.
4. Leave to get warm the engine before turning on of the fan. Check, whether there is below a radiator warm and whether the thermostat case is tight.
5. Attach to the accumulator a weight wire. Expose time on hours. Set an anticreeping code of radio.

FEATURES OF THE 6-CYLINDER ENGINE

PERFORMANCE ORDER
1. Unscrew a cover of the thermostat and put it aside together with the connected hose. Extend the thermostat.
2. Insert the thermostat with a new sealing ring into the case.
Prevention

When filling cooling liquid from system of cooling air via the ball valve on the thermostat is removed. Therefore insert the thermostat so that the ball valve was in the highest point.


3. Get a cover and screw up it with the moment of 10 N of m.

DIESEL ENGINE

Diesel engine of 2,2/2,5 l

6. Air hose
17. Thermostat cover
18. Bolt of M 6 x 25
19. Sealing ring of round section
20. A regulator cooling liquids (thermostat)

Removal


PERFORMANCE ORDER
1. Disconnect from the storage battery a weight wire.
Prevention

The anticreeping code of radio is thus erased.


2. Merge in a pure reception vessel cooling liquid.
3. Remove an air hose, for this purpose weaken its collars.
4. Unscrew a thermostat cover on the pump of system of liquid cooling and lay aside with the connected hose.
5. Take the thermostat.

Installation

PERFORMANCE ORDER
1. Insert into a cover the thermostat with a new sealing ring. Thus the edge on a cover enters into gearing in a flute of a regulator of cooling liquid.
2. Get a cover with a regulator and hardly screw up with the moment of 10 N of m.
3. Fill in cooling liquid.
4. Leave the engine to get warm until the fan will turn on. Check, whether the radiator gets warm below and whether the thermostat case is tight. Attach to the plug of the storage battery a weight wire.
5. Attach to the plug of the storage battery a weight wire.
6. Expose time on hours.
7. Enter an anticreeping code of radio.