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. 900 I Combi Coupe
2. 900 � Combi Coupe
3. 9000 Hatchback
4. 900 I Convertible
5. 900 � Convertible
6. 9000
7. 900 II Coupe
8. 900 II
9. 900 II Convertible
10. 900 I (AC4, AM4)
11. 900 � (AC4, AM4)
12. 9-5 (YS3E)
13. 9-5 Saloon (YS3E)
14. 9-3 (YS3D)
15. 9-3 Cabriolet (YS3D)
16. 9-3 ????? (YS3D)
17. 9-5 Estate (YS3E)
18. 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.