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. 626 II (GC)
2. TELSTAR II Saloon (GC)
3. CAPELLA II (GC)
4. 626 Mk II (GC)
5. TELSTAR II (GC)
6. 626 II Hatchback (GC)
7. CAPELLA II Hatchback (GC)
8. 626 Mk II Hatchback (GC)
9. TELSTAR II Hatchback (GC)
10. CHERRY II Traveller (VN10)
11. PULSAR II Traveller (VN10)
12. CHERRY II Hatchback (N10)
13. PULSAR II Hatchback (N10)
14. 310 GX II Hatchback (N10)
15. CHERRY II Coupe (N10)
16. PULSAR II Coupe (N10)
17. 310 II Coupe (N10)
18. CHERRY III (N12)
19. PULSAR III (N12)
20. LANGLEY III (N12)
21. See more in applications

The principle of the thermostat work

The classic VALEO 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.