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.

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2. MEGANE II Grandtour (KM0/1_)
3. MEGANE II Sport Tourer (KM0/1_)
4. MEGANE II (BM0/1_, CM0/1_)
5. SCENIC II (JM0/1_)
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11. GRAND ESCUDO II (JT, TE, TD)
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13. GRAND NOMADE / GRAND VITARA II (JT, TE, TD)
14. GRAND NOMADE / GRAND VITARA / GRAND ESCUDO II (JT, TE, TD)
15. MEGANE III Hatchback (BZ0/1_, B3_)
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18. GRAN TOUR III Grandtour (KZ0/1)
19. SCENIC III (JZ0/1_)
20. GRAND SCENIC III (JZ0/1_)
21. See more in applications

The principle of the thermostat work

The classic MOTORAD 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.