Thermostat, coolant - 819731 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. 500 / 595 / 695 (312_)
2. 500 (312_)
3. 500C / 595C / 695C (312_)
4. PUNTO (199_)
5. BRAVO II (198_)
6. RITMO III (198_)
7. MITO (955_)
8. GIULIETTA (940_)
9. DELTA III (844_)
10. PUNTO PURE (199_)
11. PUNTO EVO (199_)
12. GRANDE PUNTO (199_)
13. DELTA
14. 500L (351_, 352_)
15. RENEGADE SUV (BU, B1)
16. 500X (334_)
17. TIPO Saloon (356_)
18. EGEA Saloon (356_)
19. 124 Spider (348_)
20. TIPO Hatchback (356_)
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.