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. GRANADA (GU)
2. DS
3. DS Saloon
4. DS Break
5. 504 (A_, M_)
6. 504 Saloon (A_, M_)
7. 505 (551A)
8. ID
9. ID Saloon
10. ID Break
11. 404
12. 404 Saloon
13. 404 Convertible
14. 504 Break (D_, F_)
15. 604 (561A_)
16. 604 Saloon (561A_)
17. 505 Break (551D)
18. HY
19. 504 Pickup (E_)
20. J7 Van
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The principle of the thermostat work

The classic GATES 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.