Thermostat, coolant - 819792 VALEO

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. MONDEO IV Turnier (BA7)
2. MONDEO IV (BA7)
3. MONDEO IV Saloon (BA7)
4. S-MAX (WA6)
5. FOCUS III Turnier
6. S40 II (544)
7. S40 II Saloon (544)
8. C-MAX (DM2)
9. FOCUS II (DA_, HCP, DP)
10. FOCUS C-MAX (DM2)
11. V50 (545)
12. V50 Estate (545)
13. FIESTA V (JH_, JD_)
14. IKON V (JH_, JD_)
15. FOCUS II Turnier (DA_, FFS, DS)
16. FOCUS II Station Wagon (DA_, FFS, DS)
17. FOCUS II Saloon (DB_, FCH, DH)
18. GALAXY (WA6)
19. FOCUS II Convertible
20. C30 (533)
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.