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. CORSA B (S93)
2. VITA B (S93)
3. TIGRA (S93)
4. VECTRA B Hatchback (J96)
5. VECTRA B (J96)
6. ASTRA F Hatchback (T92)
7. ASTRA F (T92)
8. OPTIMA F (T92)
9. ASTRA F Estate (T92)
10. ASTRA F Convertible (T92)
11. VECTRA B Estate (J96)
12. ASTRA Mk III (F) Hatchback (T92)
13. CORSA Mk I (B) (S93)
14. TIGRA Mk I (S93)
15. VECTRA (B) Saloon (J96)
16. VECTRA (B) Hatchback (J96)
17. ASTRA Mk III (F) Saloon (T92)
18. KADETT E Combo (T85)
19. ASTRA Mk III (F) Estate (T92)
20. ASTRA F CLASSIC Hatchback (T92)
21. See more in applications

The principle of the thermostat work

The classic VALEO 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.