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. ZAFIRA TOURER C (P12)
2. ZAFIRA C (P12)
3. ASTRA J (P10)
4. ASTRA J Saloon
5. ASTRA Saloon
6. ASTRA J Sports Tourer (P10)
7. MERIVA B MPV (S10)
8. ASTRA J GTC
9. ASTRA J Coupe
10. MOKKA / MOKKA X (J13)
11. ASTRA K (B16)
12. INSIGNIA A (G09)
13. INSIGNIA A Saloon (G09)
14. INSIGNIA A Sports Tourer (G09)
15. ASTRA K Sports Tourer (B16)
16. INSIGNIA B Grand Sport (Z18)
17. INSIGNIA B Sports Tourer (Z18)
18. INSIGNIA Mk II (B) Hatchback (Z18)
19. INSIGNIA A Country Tourer (G09)
20. INSIGNIA Mk II (B) Sports Tourer (Z18)
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The principle of the thermostat work

The classic FEBI BILSTEIN 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.