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. MAXIMA / MAXIMA QX IV (A32)
2. MAXIMA IV Saloon (A32)
3. MAXIMA IV (A32)
4. QX IV (A32)
5. VECTRA B Hatchback (J96)
6. VECTRA B (J96)
7. VECTRA B Estate (J96)
8. ASTRA G Estate (T98)
9. ZAFIRA A MPV (T98)
10. MAXIMA / MAXIMA QX IV Station Wagon (A32)
11. MAXIMA / MAXIMA QX V (A33)
12. MAXIMA / MAXIMA QX V Saloon (A33)
13. CORSA C (X01)
14. VITA C (X01)
15. CORSA Mk II (C) (X01)
16. PATHFINDER II (R50)
17. TERRANO II (R50)
18. PATHFINDER II SUV (R50)
19. ASTRA G Convertible (T98)
20. ESPACE IV (JK0/1_)
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.