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. 1 (F20)
2. 5 (F10)
3. 6 Coupe (F13)
4. 7 (F01, F02, F03, F04)
5. 7 Saloon (F01, F02, F03, F04)
6. 5 Touring (F11)
7. 6 Convertible (F12)
8. X3 (F25)
9. X3 SAV (F25)
10. 5 Gran Turismo (F07)
11. 3 (F30, F80)
12. X5 (F15, F85)
13. X5 SAV (F15, F85)
14. 3 Touring (E91)
15. 3 Coupe (E92)
16. 3 Convertible (E93)
17. 4 Coupe (F32, F82)
18. 1 (F21)
19. 3 Gran Turismo (F34)
20. 3 Touring (F31)
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The principle of the thermostat work

The classic CALORSTAT by Vernet 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.