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. 166 (936_)
2. 166 Saloon (936_)
3. 156 (932_)
4. 147 (937_)
5. 156 Sportwagon (932_)
6. THESIS (841_)
7. GT (937_)
8. STILO (192_)
9. STILO Multi Wagon (192_)
10. CROMA (194_)
11. 159 (939_)
12. 159 Saloon (939_)
13. 159 Sportwagon (939_)
14. BRERA (939_)
15. BRAVO II (198_)
16. RITMO III (198_)
17. SPIDER (939_)
18. STILO VAN (192_)
19. 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.