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. DS
2. DS Saloon
3. 504 (A_, M_)
4. 504 Saloon (A_, M_)
5. 505 (551A)
6. ID
7. ID Saloon
8. ID Break
9. 404
10. 404 Saloon
11. 504 Break (D_, F_)
12. 504 Pickup (E_)
13. J7 Van
14. J9 Van
15. J7 Bus
16. J7 Platform/Chassis
17. J9 Platform/Chassis
18. 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.