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. 508 I (8D_)
2. 508 SW I (8E_)
3. GALAXY (WA6)
4. EXPERT TEPEE (VF3X_)
5. FOCUS II Turnier (DA_, FFS, DS)
6. FOCUS II Station Wagon (DA_, FFS, DS)
7. FOCUS II (DA_, HCP, DP)
8. FOCUS C-MAX (DM2)
9. C-MAX (DM2)
10. SCUDO Bus (270_, 272_)
11. SCUDO MPV (270_, 272_)
12. SCUDO Van (270_, 272_)
13. 307 (3A/C)
14. 407 (6D_)
15. 407 Saloon (6D_)
16. C4 I (LC_)
17. C4 Coupe (LA_)
18. C5 II (RC_)
19. C5 II Break (RE_)
20. 307 CC (3B)
21. See more in applications

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.