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. ASTRA Mk IV (G) Hatchback (T98)
8. ASTRA Mk IV (G) Saloon (T98)
9. ASTRA Mk IV (G) Estate (T98)
10. ZAFIRA A MPV (T98)
11. ZAFIRA Mk I (A) (T98)
12. ASTRA G Coupe (T98)
13. ASTRA Mk IV (G) Coupe (T98)
14. CORSA C (X01)
15. VITA C (X01)
16. CORSA Mk II (C) (X01)
17. ASTRA G Convertible (T98)
18. ASTRA Mk IV (G) Convertible (T98)
19. VECTRA C GTS (Z02)
20. MERIVA A MPV (X03)
21. See more in applications

The principle of the thermostat work

The classic MAGNETI MARELLI 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.