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. MEGANE I (BA0/1_)
2. VIVARO A Platform/Chassis (X83)
3. MEGANE Scenic (JA0/1_)
4. MEGANE I Classic (LA0/1_)
5. MEGANE I Coach (DA0/1_)
6. MEGANE I Coupe (DA0/1_)
7. CLIO II (BB_, CB_)
8. CLIO Mk II (BB_, CB_)
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10. CLIO MIO II (BB_, CB_)
11. KANGOO Express (FC0/1_)
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13. ESPACE III (JE0_)
14. ESPACE Mk III (JE0_)
15. MEGANE I Grandtour (KA0/1_)
16. MEGANE I Break (KA0/1_)
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18. SCENIC I MPV (JA0/1_, FA0_)
19. LAGUNA II (BG0/1_)
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21. See more in applications

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.