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. FELICIA I (6U1)
2. FELICIA � (6U1)
3. FELICIA I Estate (6U5)
4. FELICIA � Estate (6U5)
5. FELICIA I Pickup (6UF, 6U7)
6. FELICIA � Pickup (6UF, 6U7)
7. FABIA I (6Y2)
8. FELICIA II (6U1)
9. FELICIA Mk II (6U1)
10. OCTAVIA I (1U2)
11. FABIA I Combi (6Y5)
12. FABIA I Saloon (6Y3)
13. FABIA I Praktik (6Y5)
14. LUPO (6X1, 6E1)
15. AROSA (6H)
16. FELICIA Cube Van (6U5)
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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.