Thermostat, coolant - 819717 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. SWIFT IV (FZ, NZ)
2. SWIFT MK V (FZ, NZ)
3. SWIFT III (FZ, NZ)
4. ASTRA J Sports Tourer (P10)
5. PANDA (169_)
6. PANDA / PANDA CLASSIC (169_)
7. PUNTO EVO (199_)
8. GRANDE PUNTO (199_)
9. PUNTO (199_)
10. FIORINO Box Body/MPV (225_)
11. ASTRA Mk VI (J) Estate (P10)
12. MERIVA Mk II (B) (S10)
13. NEMO Van (AA_)
14. QUBO (225_)
15. NEMO Estate
16. BIPPER TEPEE
17. BIPPER (AA_)
18. CORSAVAN Mk III (D) Hatchback Van (S07)
19. PUNTO Hatchback Van (199_)
20. CORSA D Hatchback Van (S07)
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.