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. ZAFIRA B Box Body/MPV (A05)
2. CORSA D (S07)
3. CORSA Mk III (D) (S07)
4. MERIVA A MPV (X03)
5. MERIVA Mk I (A) (X03)
6. ASTRA H (A04)
7. ASTRA H TwinTop (A04)
8. ASTRA H Estate (A04)
9. ASTRA H GTC (A04)
10. ASTRA Mk V (H) Sport Hatch (A04)
11. ASTRA Mk V (H) Estate (A04)
12. ZAFIRA / ZAFIRA FAMILY B (A05)
13. STILO (192_)
14. INSIGNIA A Saloon (G09)
15. INSIGNIA A Sports Tourer (G09)
16. INSIGNIA Mk I (A) Hatchback (G09)
17. INSIGNIA Mk I (A) Saloon (G09)
18. INSIGNIA Mk I (A) Sports Tourer (G09)
19. INSIGNIA A (G09)
20. 9-5 (YS3G)
21. See more in applications

The principle of the thermostat work

The classic HOFFER 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.