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. FOCUS II Turnier (DA_, FFS, DS)
2. FOCUS II Station Wagon (DA_, FFS, DS)
3. FOCUS II (DA_, HCP, DP)
4. C-MAX (DM2)
5. FOCUS C-MAX (DM2)
6. 3 Saloon (BK)
7. AXELA Saloon (BK)
8. 3 (BK)
9. AXELA (BK)
10. XSARA PICASSO (N68)
11. 407 (6D_)
12. 407 Saloon (6D_)
13. 307 (3A/C)
14. 307 SW (3H)
15. 307 Break (3E)
16. 307 Estate (3E)
17. 407 SW (6E_)
18. 206 Hatchback (2A/C)
19. 206 SW (2E/K)
20. FOCUS II Saloon (DB_, FCH, DH)
21. See more in applications

The principle of the thermostat work

The classic HERTH+BUSS JAKOPARTS 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.