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. 3 Saloon (BL)
2. AXELA Saloon (BL)
3. 3 (BL)
4. AXELA (BL)
5. 3 SPORT (BL)
6. FOCUS II Turnier (DA_, FFS, DS)
7. FOCUS II Station Wagon (DA_, FFS, DS)
8. FOCUS II (DA_, HCP, DP)
9. C-MAX (DM2)
10. PARTNER Platform/Chassis
11. FOCUS C-MAX (DM2)
12. 3 Saloon (BK)
13. AXELA Saloon (BK)
14. 3 (BK)
15. AXELA (BK)
16. XSARA PICASSO (N68)
17. 407 (6D_)
18. 407 Saloon (6D_)
19. 307 (3A/C)
20. 307 SW (3H)
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The principle of the thermostat work

The classic SASIC 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.