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. VECTRA A Hatchback (J89)
2. VECTRA A (J89)
3. CALIBRA A (C89)
4. OMEGA B (V94)
5. OMEGA B Estate (V94)
6. 900 II
7. 900 II Convertible
8. 9000
9. 9000 Hatchback
10. VECTRA B Hatchback (J96)
11. VECTRA B (J96)
12. VECTRA B Estate (J96)
13. SINTRA (APV)
14. 900 II Coupe
15. CALIBRA (C89)
16. OMEGA (B) Saloon (V94)
17. OMEGA (B) Estate (V94)
18. 9-5 (YS3E)
19. 9-5 Saloon (YS3E)
20. VECTRA (B) Saloon (J96)
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.