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. 306 Hatchback (7A, 7C, N3, N5)
2. BOXER Bus (230P)
3. 605 (6B)
4. 605 Saloon (6B)
5. XANTIA (X1_, X2_)
6. JUMPER Bus (230P)
7. RELAY Bus (230P)
8. XM (Y4)
9. XM Break (Y4)
10. XM Estate (Y4)
11. XANTIA Break (X1_, X2_)
12. XANTIA Estate (X1_, X2_)
13. 406 (8B)
14. 406 Saloon (8B)
15. ZX (N2)
16. 406 Break (8E/F)
17. 406 Estate (8E/F)
18. BOXER Van (230L)
19. BOXER FURGON Van (230L)
20. 406 Coupe (8C)
21. See more in applications

The principle of the thermostat work

The classic METZGER 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.