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. CLIO IV (BH_)
2. LUTECIA IV (BH_)
3. CLIO MIO IV (BH_)
4. CLIO IV Grandtour (KH_)
5. CLIO IV Sport Tourer (KH_)
6. CLIO IV SPORT TOURER (KH_)
7. SANDERO II
8. LOGAN II
9. CAPTUR I (J5_, H5_)
10. LOGAN MCV II
11. THALIA III (L8_)
12. SYMBOL III (L8_)
13. CLIO IV Hatchback Van (BH_)
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The principle of the thermostat work

The classic VALEO 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.