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. 121 II (DB)
2. 121 II Saloon (DB)
3. REVUE II (DB)
4. 323 S V (BA)
5. 323 PROTEGE V Saloon (BA)
6. PROTEGE V (BA)
7. 323 S Mk V (BA)
8. FAMILIA V (BA)
9. 323 PROTEGE V (BA)
10. ETUDE V (BA)
11. 323 C V (BA)
12. 323 ASTINA V (BA)
13. 323 C Mk V (BA)
14. 323 F V (BA)
15. 323 F Mk V (BA)
16. FAMILIA / LANTIS V (BA)
17. LANTIS V (BA)
18. JAZZ I (AA)
19. CITY I (AA)
20. FIT I (AA)
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.