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. KADETT E Hatchback (T85)
3. KADETT E (T85)
4. MONZA E (T85)
5. KADETT E Estate (T85)
6. KADETT E Convertible (T85)
7. VECTRA A Hatchback (J89)
8. ASCONA C (J82)
9. VECTRA A (J89)
10. ASTRA F Hatchback (T92)
11. ASTRA F (T92)
12. OPTIMA F (T92)
13. ASTRA F Convertible (T92)
14. ASTRA F Estate (T92)
15. CORSA B (S93)
16. VITA B (S93)
17. COMBO Box Body/MPV (71_)
18. VECTRA B Hatchback (J96)
19. VECTRA B (J96)
20. VECTRA B Estate (J96)
21. See more in applications

The principle of the thermostat work

The classic METZGER 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.