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. 206 Van
2. C3 I (FC_, FN_)
3. FIESTA V (JH_, JD_)
4. IKON V (JH_, JD_)
5. 206 Hatchback (2A/C)
6. 307 (3A/C)
7. FUSION (JU_)
8. 206 SW (2E/K)
9. 2 (DY)
10. DEMIO (DY)
11. C2 (JM_)
12. XSARA (N1)
13. XSARA Coupe (N0)
14. XSARA Break (N2)
15. XSARA Estate (N2)
16. C3 Pluriel (HB_)
17. 307 Break (3E)
18. 307 Estate (3E)
19. 1007 (KM_)
20. C1 (PM_, PN_)
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.