Thermostat, coolant - 820294 VALEO

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. GIULIETTA (940_)
2. BRAVO II (198_)
3. RITMO III (198_)
4. MUSA (350_)
5. 159 (939_)
6. 159 Saloon (939_)
7. 159 Sportwagon (939_)
8. FREEMONT (345_)
9. FREEMONT SUV (345_)
10. IDEA (350_)
11. DELTA III (844_)
12. DUCATO Bus (250_, 290_)
13. DUCATO Bus (250_, 290_, 560_)
14. DUCATO Van (250_, 290_)
15. DUCATO Platform/Chassis (250_, 290_)
16. SX4 S-CROSS (JY)
17. S-CROSS (JY)
18. S-CROSS SUV (JY)
19. SX4 CROSSOVER (JY)
20. SX4 (JY)
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.