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 (W212)
2. E-CLASS Saloon (W212)
3. CLK (C209)
4. C-CLASS (W203)
5. C-CLASS Saloon (W203)
6. C-CLASS T-Model (S203)
7. C-CLASS Coupe (CL203)
8. C-CLASS Sportcoupe (CL203)
9. C-CLASS Coupe Sport (CL203)
10. C-CLASS Sportscoupe (CL203)
11. E-CLASS (W211)
12. E-CLASS Saloon (W211)
13. E-CLASS T-Model (S211)
14. CLK Convertible (A209)
15. SLK (R171)
16. C-CLASS (W204)
17. C-CLASS Saloon (W204)
18. C-CLASS T-Model (S204)
19. CLC-CLASS (CL203)
20. SPRINTER 3-t Platform/Chassis (906)
21. See more in applications

The principle of the thermostat work

The classic VALEO 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.