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. FIESTA V (JH_, JD_)
3. IKON V (JH_, JD_)
4. FUSION (JU_)
5. 206 SW (2E/K)
6. 2 (DY)
7. DEMIO (DY)
8. C2 (JM_)
9. XSARA (N1)
10. XSARA Coupe (N0)
11. XSARA Break (N2)
12. XSARA Estate (N2)
13. 1007 (KM_)
14. C1 (PM_, PN_)
15. 107 (PM_, PN_)
16. AYGO (_B1_)
17. 207 (WA_, WC_)
18. 207/207+ (WA_, WC_)
19. C3 I (FC_, FN_)
20. NEMO Van (AA_)
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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.