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 B Hatchback (J96)
2. VECTRA B (J96)
3. VECTRA B Estate (J96)
4. ASTRA G Hatchback (T98)
5. ASTRA G Estate (T98)
6. ASTRA G Saloon (T98)
7. ZAFIRA A MPV (T98)
8. ASTRA G Coupe (T98)
9. CORSA C (X01)
10. VITA C (X01)
11. ASTRA G Convertible (T98)
12. VECTRA C (Z02)
13. VECTRA C GTS (Z02)
14. MERIVA A MPV (X03)
15. SIGNUM Hatchback (Z03)
16. VECTRA C Estate (Z02)
17. ASTRA H (A04)
18. ASTRA H Estate (A04)
19. TIGRA TwinTop (X04)
20. ASTRA H GTC (A04)
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.