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. LANTRA I (J-1)
2. LANTRA I Saloon (J-1)
3. ELANTRA I (J-1)
4. LANTRA � (J-1)
5. BIMANTARA NENGGALA I (J-1)
6. PONY (X-2)
7. EXCEL (X-2)
8. PONY / EXCEL Saloon (X-2)
9. EXCEL Saloon (X-2)
10. S COUPE (SLC)
11. SONATA II (Y-2)
12. SONATA � (Y-2)
13. SONATA III (Y-3)
14. SONATA III Saloon (Y-3)
15. SONATA Mk II (Y-3)
16. SONICA III (Y-3)
17. SPORTAGE SUV (K00)
18. SPORTAGE I SUV (K00)
19. PONY (X-1)
20. EXCEL (X-1)
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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.