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. BRAVO I (182_)
2. BRAVA (182_)
3. MAREA (185_)
4. MAREA Weekend (185_)
5. PALIO (178_)
6. PALIO Weekend (178_, 173_, 373_, 374_)
7. WEEKEND Weekend (178_, 173_, 373_, 374_)
8. PALIO WEEKEND / WEEKEND Weekend (178_, 173_, 373_, 374_)
9. PALIO WEEKEND Weekend (178_, 173_, 373_, 374_)
10. MULTIPLA (186_)
11. DEDRA (835_)
12. LYBRA (839_)
13. LYBRA SW (839_)
14. DEDRA SW (835_)
15. SIENA (178_, 172_)
16. ALBEA (178_, 172_)
17. PETRA (178_, 172_)
18. PALIO / ALBEA Saloon (178_, 172_)
19. STILO (192_)
20. DOBLO MPV (119_, 223_)
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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.