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. MERIVA Mk II (B) (S10)
4. ZAFIRA Mk II (B) (A05)
5. ASTRA H Estate Van (L70)
6. ASTRA H Van (L70)
7. ZAFIRA B Box Body/MPV (A05)
8. MERIVA Mk I (A) (X03)
9. ASTRA Mk VI (J) (P10)
10. ASTRA J (P10)
11. ASTRA Mk VI (J) GTC (P10)
12. ASTRA G Hatchback (T98)
13. ASTRA G Saloon (T98)
14. ASTRAVAN Mk V (H) Estate Van (A04)
15. ASTRA J GTC
16. ASTRA J Coupe
17. ASTRA G Estate (T98)
18. ASTRA Mk IV (G) Hatchback (T98)
19. ASTRA Mk IV (G) Estate (T98)
20. ASTRA Mk IV (G) Saloon (T98)
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The principle of the thermostat work

The classic VEMO 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.