Thermostat, coolant - 819906 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 (F10)
2. 1 (F20)
3. X1 (E84)
4. X1 SAV (E84)
5. X1 SUV (E84)
6. 5 Touring (F11)
7. Z4 Roadster (E89)
8. X3 (F25)
9. X3 SAV (F25)
10. 3 (F30, F80)
11. 4 Coupe (F32, F82)
12. 1 (F21)
13. 3 Touring (F31)
14. 2 Coupe (F22, F87)
15. 4 Convertible (F33, F83)
16. 3 Gran Turismo (F34)
17. 5 Gran Turismo (F07)
18. 4 Gran Coupe (F36)
19. X4 (F26)
20. X4 SUV (F26)
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.