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. C-CLASS (W202)
2. C-CLASS Saloon (W202)
3. E-CLASS (W210)
4. E-CLASS Saloon (W210)
5. C-CLASS T-Model (S202)
6. C-CLASS Break (S202)
7. E-CLASS T-Model (S210)
8. E-CLASS Break (S210)
9. MUSSO (FJ)
10. CLK (C208)
11. KORANDO (KJ)
12. KORANDO Cabrio (KJ)
13. CLK Convertible (A208)
14. REXTON / REXTON II (GAB_)
15. REXTON (GAB_)
16. REXTON / REXTON II SUV (GAB_)
17. 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.