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. 9 (L42_)
2. 9 Saloon (L42_)
3. ALLIANCE (L42_)
4. 11 (B/C37_)
5. ENCORE (B/C37_)
6. 14 (121_)
7. LNA
8. AX (ZA-_)
9. VISA
10. BX (XB-_)
11. BX Break (XB-_)
12. C15 Van (VD_)
13. XM (Y3)
14. XM Break (Y3)
15. XM Estate (Y3)
16. ZX (N2)
17. XANTIA (X1_, X2_)
18. 104
19. 104 Coupe
20. 205 I (741A/C)
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The principle of the thermostat work

The classic WAHLER 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.