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. G-CLASS (W461)
2. SPRINTER 3,5-t Bus (906)
3. E-CLASS (W212)
4. E-CLASS Saloon (W212)
5. S-CLASS (W221)
6. S-CLASS Saloon (W221)
7. CLS (C219)
8. R-CLASS (W251, V251)
9. C-CLASS T-Model (S203)
10. E-CLASS T-Model (S211)
11. E-CLASS (W211)
12. E-CLASS Saloon (W211)
13. GL-CLASS (X164)
14. GL-CLASS SUV (X164)
15. SPRINTER 3-t Van (906)
16. SPRINTER 3-t Platform/Chassis (906)
17. SPRINTER 3,5-t Van (906)
18. SPRINTER 3,5-t Platform/Chassis (906)
19. SPRINTER 5-t Van (906)
20. SPRINTER 5-t Platform/Chassis (906)
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The principle of the thermostat work

The classic FEBI BILSTEIN 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.