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 (W210)
2. E-CLASS Saloon (W210)
3. E-CLASS T-Model (S210)
4. E-CLASS Break (S210)
5. CLK (C208)
6. C-CLASS T-Model (S202)
7. C-CLASS Break (S202)
8. C-CLASS (W202)
9. C-CLASS Saloon (W202)
10. M-CLASS (W163)
11. M-CLASS SUV (W163)
12. G-CLASS (W463)
13. G-CLASS SUV (W463)
14. G-CLASS Cabrio (W463)
15. SL (R129)
16. CLK Convertible (A208)
17. S-CLASS (W220)
18. S-CLASS Saloon (W220)
19. S-CLASS Coupe (C215)
20. CL-CLASS Coupe (C215)
21. See more in applications

The principle of the thermostat work

The classic MAGNETI MARELLI 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.