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. ANTARA (L07)
2. INSIGNIA A (G09)
3. CAPTIVA (C100, C140)
4. CAPTIVA SUV (C100, C140)
5. INSIGNIA A Sports Tourer (G09)
6. INSIGNIA A Saloon (G09)
7. SPEEDSTER (E01)
8. ASTRA G Coupe (T98)
9. VECTRA B Hatchback (J96)
10. VECTRA B (J96)
11. VECTRA B Estate (J96)
12. ZAFIRA A MPV (T98)
13. ASTRA G Convertible (T98)
14. ASTRA G Hatchback (T98)
15. ASTRA G Saloon (T98)
16. ASTRA G Estate (T98)
17. VECTRA C (Z02)
18. VECTRA C GTS (Z02)
19. 9-3 (YS3F, E79, D79, D75)
20. 9-3 Saloon (YS3F, E79, D79, D75)
21. See more in applications

The principle of the thermostat work

The classic AUTOMEGA 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.