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. C25 Bus (280_, 290_)
2. 205 II (20A/C)
3. 205 Mk II (20A/C)
4. 205 I (741A/C)
5. 205 � (741A/C)
6. 305 II (581M)
7. 305 Mk II (581M)
8. 305 II Break (581E)
9. 305 Mk II Break (581E)
10. DS4 (NX_)
11. 407 (6D_)
12. 407 Saloon (6D_)
13. XSARA PICASSO (N68)
14. 206 Hatchback (2A/C)
15. C4 PICASSO I MPV (UD_)
16. 406 (8B)
17. 406 Saloon (8B)
18. 406 Break (8E/F)
19. 406 Estate (8E/F)
20. 406 Coupe (8C)
21. See more in applications

The principle of the thermostat work

The classic MAGNETI MARELLI 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.