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. FIESTA I (GFBT)
2. FIESTA � (GFBT)
3. FIESTA II (FBD)
4. FIESTA Mk II (FBD)
5. FIESTA III (GFJ)
6. FIESTA Mk III (GFJ)
7. FIESTA Van (F3L, F5L)
8. COURIER Van (F3L, F5L)
9. ESCORT V (AAL, ABL)
10. ESCORT Mk VI (AAL, ABL)
11. ORION III (GAL)
12. VERONA III (GAL)
13. ESCORT V Turnier (ANL)
14. ESCORT NOMADE V Turnier (ANL)
15. ESCORT V Break (ANL)
16. ESCORT Mk V Turnier (ANL)
17. FIESTA IV (JA_, JB_)
18. FIESTA Mk IV (JA_, JB_)
19. ESCORT VI (GAL, AAL, ABL)
20. ESCORT Mk VII (GAL, AAL, ABL)
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.