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 A (J89)
2. VECTRA A Hatchback (J89)
3. COMBO Box Body/MPV (71_)
4. VECTRA B Hatchback (J96)
5. VECTRA B (J96)
6. ASTRA Mk III (F) Hatchback (T92)
7. ASTRA Mk III (F) Estate (T92)
8. CAVALIER Mk III Saloon (J89)
9. CORSA B (S93)
10. VITA B (S93)
11. CORSA Mk I (B) (S93)
12. COMBO Mk I (B) (S93)
13. VECTRA (B) Saloon (J96)
14. VECTRA (B) Hatchback (J96)
15. ASTRA Mk III (F) Saloon (T92)
16. CORSAVAN Mk I (B) Hatchback Van (S93)
17. CORSA B Hatchback Van (S93)
18. VECTRA B Estate (J96)
19. ASTRA F Estate Van (T92)
20. 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.