Thermostat, coolant - 821715 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. PANDA (169_)
2. PANDA / PANDA CLASSIC (169_)
3. YPSILON (843_)
4. 500 (312_)
5. YPSILON (312_)
6. PANDA Hatchback Van (169_)
7. PANDA (312_, 319_)
8. PUNTO (199_)
9. PUNTO PURE (199_)
10. KA (RU8)
11. 500 C (312_)
12. YPSILON
13. PANDA VAN (312_, 519_)
14. KA+ (UK, FK)
15. KA (UK, FK)
16. FIGO (UK, FK)
17. KA+ Saloon (TK, FK)
18. KA+ / KA Saloon (TK, FK)
19. FIGO ASPIRE / ASPIRE Saloon (TK, FK)
20. FIGO Saloon (TK, FK)
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.