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. 9-3 Convertible (YS3F)
2. 9-3 (YS3F, E79, D79, D75)
3. 9-3 Saloon (YS3F, E79, D79, D75)
4. ASTRA H Estate Van (L70)
5. ASTRA H Van (L70)
6. GRANDE PUNTO (199_)
7. PUNTO (199_)
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14. MINI CLUBMAN Estate (R55)
15. CLUBMAN (R55)
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18. SONATA IV Saloon (EF)
19. SONATA Mk III (EF)
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The principle of the thermostat work

The classic MAGNETI MARELLI 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.