Thermostat, coolant - 819739 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. 5 (CW)
2. PREMACY (CW)
3. 3 (BK)
4. AXELA (BK)
5. 3 Saloon (BK)
6. AXELA Saloon (BK)
7. 5 (CR19)
8. PREMACY (CR19)
9. MX-5 III (NC)
10. MX-5 Mk III (NC)
11. ROADSTER III (NC)
12. MIATA III (NC)
13. 3 (BM, BN)
14. AXELA (BM, BN)
15. MONDEO V Saloon (CD)
16. FUSION V Saloon (CD)
17. 3 (BL)
18. AXELA (BL)
19. 3 SPORT (BL)
20. 3 Saloon (BL)
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.