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. C4 I (LC_)
2. C5 II (RC_)
3. C5 II Break (RE_)
4. 307 (3A/C)
5. 307 Break (3E)
6. 307 Estate (3E)
7. 307 SW (3H)
8. 307 CC (3B)
9. 407 SW (6E_)
10. 407 (6D_)
11. 407 Saloon (6D_)
12. C4 GRAND PICASSO I (UA_)
13. C4 I Saloon
14. C4 PALLAS I Saloon
15. C4 Coupe (LA_)
16. C5 Estate Van (DE_, RE_)
17. See more in applications

The principle of the thermostat work

The classic 3RG 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.