Thermostat, coolant - 819724 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. SCENIC III (JZ0/1_)
2. GRAND SCENIC III (JZ0/1_)
3. NV200 / EVALIA Bus
4. EVALIA Bus
5. NV200 Bus
6. KANGOO Express (FW0/1_)
7. KANGOO Rapid (FW0/1_)
8. CLA Coupe (C117)
9. LODGY (JS_)
10. MEGANE III Hatchback (BZ0/1_, B3_)
11. MEGANE III Coupe (DZ0/1_)
12. MEGANE III Grandtour (KZ0/1)
13. GRAN TOUR III Grandtour (KZ0/1)
14. FLUENCE (L3_)
15. NV200 Van
16. JUKE (F15)
17. SANDERO II
18. NOTE (E12)
19. VERSA NOTE (E12)
20. A-CLASS (W176)
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.