Thermostat, coolant - 819700 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. C-MAX II (DXA/CB7, DXA/CEU)
2. GRAND C-MAX (DXA/CB7, DXA/CEU)
3. 5 (CW)
4. PREMACY (CW)
5. C30 (533)
6. 3 Saloon (BL)
7. AXELA Saloon (BL)
8. 3 (BL)
9. AXELA (BL)
10. 3 SPORT (BL)
11. GALAXY (WA6)
12. S-MAX (WA6)
13. MONDEO IV (BA7)
14. MONDEO IV Turnier (BA7)
15. S40 II (544)
16. S40 II Saloon (544)
17. C3 PICASSO (SH_)
18. FOCUS III Saloon
19. FOCUS III
20. FOCUS III Turnier
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.