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. KADETT E Hatchback (T85)
2. KADETT E (T85)
3. MONZA E (T85)
4. KADETT E Estate (T85)
5. VECTRA A Hatchback (J89)
6. VECTRA A (J89)
7. ASTRA F Hatchback (T92)
8. ASTRA F (T92)
9. OPTIMA F (T92)
10. ASTRA F Estate (T92)
11. KADETT E Combo (T85)
12. ASTRA G Hatchback (T98)
13. ASTRA G Estate (T98)
14. ASTRA G Saloon (T98)
15. ASTRA F Estate Van (T92)
16. KADETT E Estate Van (T85)
17. ASTRA G Estate Van (F70)
18. ASTRA G Delvan (F70)
19. See more in applications

The principle of the thermostat work

The classic AUTOMEGA 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.