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. 305 I (581A)
3. 305 � (581A)
4. 305 II (581M)
5. 305 Mk II (581M)
6. 305 II Break (581E)
7. 305 Mk II Break (581E)
8. 305 I Break (581D)
9. 305 � Break (581D)
10. 505 (551A)
11. 505 Break (551D)
12. J5 Bus (280P)
13. DUCATO Panorama (280_)
14. DUCATO Panorama (290_)
15. 304 Break (_04D_)
16. J5 Bus (290P)
17. J5 Platform/Chassis (280L)
18. DUCATO Van (280_)
19. DUCATO Platform/Chassis (290_)
20. J5 Platform/Chassis (290L)
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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.