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. C15 Van (VD_)
2. 205 I Convertible (741B, 20D)
3. 205 � Convertible (741B, 20D)
4. 205 II (20A/C)
5. 205 Mk II (20A/C)
6. 309 I (10C, 10A)
7. 309 � (10C, 10A)
8. BX (XB-_)
9. 309 II (3C, 3A)
10. 309 Mk II (3C, 3A)
11. 206+ (2L_, 2M_)
12. 207 Saloon
13. 207 PASSION Saloon
14. C3 II (SC_)
15. 207 (WA_, WC_)
16. 207/207+ (WA_, WC_)
17. BX Break (XB-_)
18. C3 I (FC_, FN_)
19. C3 Pluriel (HB_)
20. C2 (JM_)
21. See more in applications

The principle of the thermostat work

The classic HOFFER 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.