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. 407 (6D_)
2. 407 Saloon (6D_)
3. XSARA PICASSO (N68)
4. 206 Hatchback (2A/C)
5. C4 PICASSO I MPV (UD_)
6. 406 (8B)
7. 406 Saloon (8B)
8. 406 Break (8E/F)
9. 406 Estate (8E/F)
10. 406 Coupe (8C)
11. 206 CC (2D)
12. 607 (9D, 9U)
13. 607 Saloon (9D, 9U)
14. EXPERT (224_)
15. XSARA (N1)
16. XSARA Break (N2)
17. XSARA Estate (N2)
18. XSARA Coupe (N0)
19. C5 I (DC_)
20. 307 (3A/C)
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.