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 A Hatchback (S83)
2. VECTRA A (J89)
3. ASTRA F Hatchback (T92)
4. ASTRA F (T92)
5. OPTIMA F (T92)
6. ASTRA F Estate (T92)
7. CORSA B (S93)
8. VITA B (S93)
9. COMBO Box Body/MPV (71_)
10. 323 S V (BA)
11. 323 PROTEGE V Saloon (BA)
12. PROTEGE V (BA)
13. 323 S Mk V (BA)
14. FAMILIA V (BA)
15. 323 PROTEGE V (BA)
16. ETUDE V (BA)
17. VECTRA B Hatchback (J96)
18. VECTRA B (J96)
19. ASTRA Mk II Hatchback (T85)
20. ASTRA Mk III (F) Hatchback (T92)
21. See more in applications

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.