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. 19 I (B/C53_)
7. 19 � (B/C53_)
8. 19 II Chamade (L53_)
9. 19 Mk II Chamade (L53_)
10. 19 II (B/C53_)
11. 19 Mk II (B/C53_)
12. 19 I Chamade (L53_)
13. 19 � Chamade (L53_)
14. 19 II Cabriolet (D53_, 853_)
15. 19 Mk II Cabriolet (D53_, 853_)
16. 21 Saloon (L48_)
17. 21 (B48_)
18. 21 Estate (K48_)
19. 21 Savanna (K48_)
20. CLIO I (B/C57_, 5/357_)
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.