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. ASTRA J Sports Tourer (P10)
2. ASTRA Mk VI (J) Estate (P10)
3. CORSA D Hatchback Van (S07)
4. CORSA D (S07)
5. AVEO Hatchback (T300)
6. SONIC Hatchback (T300)
7. AVEO Saloon (T300)
8. SONIC Saloon (T300)
9. ASTRA J GTC
10. ASTRA J Coupe
11. ASTRA Mk VI (J) GTC (P10)
12. ADAM (M13)
13. ASTRA J (P10)
14. ASTRA Mk VI (J) (P10)
15. MERIVA B MPV (S10)
16. CORSA Mk III (D) (S07)
17. MERIVA Mk II (B) (S10)
18. CORSAVAN Mk III (D) Hatchback Van (S07)
19. ASTRA J Saloon
20. ASTRA Saloon
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The principle of the thermostat work

The classic DENSO 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.