Thermostat is a device for maintaining a static (constant) temperature, as its name implies. There are thermostats of different designs in many devices and mechanisms, from water heaters to refrigerators. There is also a thermostat in a car's internal combustion engine (liquid-cooled, of course). In a car, the thermostat regulates the temperature of the coolant (antifreeze): it accelerates the warm-up of a cold engine and provides heat removal from the hot one. Therefore, the engine works more efficiently and more comfortably for the driver, especially in winter - without a thermostat, the stove would usually blew cold air.

1. E-CLASS (W124)
2. E-CLASS Saloon (W124)
3. E-CLASS T-Model (S124)
4. E-CLASS Break (S124)
5. E-CLASS Convertible (A124)
6. E-CLASS Coupe (C124)
7. C-CLASS (W202)
8. C-CLASS Saloon (W202)
9. SPRINTER 2-t Bus (901, 902)
10. 124 Saloon (W124)
11. C-CLASS T-Model (S202)
12. C-CLASS Break (S202)
13. SLK (R170)
14. CLK (C208)
15. E-CLASS T-Model (S210)
16. E-CLASS Break (S210)
17. E-CLASS (W210)
18. E-CLASS Saloon (W210)
19. SPRINTER 3-t Bus (903)
20. SPRINTER 2-t Platform/Chassis (901, 902)
21. See more in applications

The principle of the thermostat work

The classic TOPRAN brand Thermostat, coolant is a movable valve that moves due to a change in the external environment - heating or cooling of antifreeze. The thermostat is made of a thermoelement filled with a substance resembling wax in structure - ceresin, with the addition of copper powder, graphite or aluminum for better thermal conductivity. At a certain temperature of the antifreeze, ceresin expands, opening the thermostat valve. When the motor cools down, ceresin contracts and the thermostat closes again.