THERMOSTAT COOLANT FOR VOLVO V60/I/Van C30 C70/II/Convertible/X/SUV S40 V50 2.0L HELLA 8MT 354 777-881

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. V60 I (155, 157)
2. C30 (533)
3. C70 II Convertible (542)
4. S40 II (544)
5. S40 II Saloon (544)
6. V50 (545)
7. V50 Estate (545)
8. S80 II (124)
9. S80 II Saloon (124)
10. V70 III (135)
11. S60 II (134)
12. XC60 (156)
13. XC60 SUV (156)
14. XC70 II (136)
15. XC70 II Estate (136)
16. XC70 II SUV (136)
17. V40 Hatchback (525, 526)
18. V70 Estate Van (135)
19. V40 Hatchback Van (525, 526)
20. V60 Estate Van (155)
21. See more in applications

The principle of the thermostat work

The classic HELLA 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.