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. ASTRA J Sports Tourer (P10)
2. ASTRA J (P10)
3. MERIVA B MPV (S10)
4. INSIGNIA A (G09)
5. INSIGNIA A Saloon (G09)
6. ASTRA J GTC
7. ASTRA J Coupe
8. ZAFIRA TOURER C (P12)
9. ZAFIRA C (P12)
10. INSIGNIA A Sports Tourer (G09)
11. MOKKA / MOKKA X (J13)
12. ASTRA J Saloon
13. ASTRA Saloon
14. CORSA D (S07)
15. CASCADA (W13)
16. CORSA E (X15)
17. ADAM (M13)
18. 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.