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. 9-3 (YS3F, E79, D79, D75)
3. 9-3 Saloon (YS3F, E79, D79, D75)
4. 9-3 Estate (E50)
5. INSIGNIA A (G09)
6. INSIGNIA A Sports Tourer (G09)
7. CAPTIVA (C100, C140)
8. CAPTIVA SUV (C100, C140)
9. INSIGNIA A Saloon (G09)
10. 9-3X (YS3)
11. 9-3X Estate (YS3)
12. 9-3 Convertible (YS3F)
13. ASTRA Mk IV (G) Coupe (T98)
14. MALIBU (V300)
15. SPEEDSTER (E01)
16. ASTRA G Coupe (T98)
17. VX220 Convertible (E01)
18. VECTRA B Hatchback (J96)
19. VECTRA B (J96)
20. VECTRA B Estate (J96)
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The principle of the thermostat work

The classic BorgWarner (Wahler) 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.