Thermostat, coolant - V42-99-0015 VEMO

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. XF (X250)
2. XF Saloon (X250)
3. S-TYPE (X200)
4. S-TYPE Saloon (X200)
5. S-TYPE ESPORTIVO (X200)
6. 607 (9D, 9U)
7. 607 Saloon (9D, 9U)
8. C6 (TD_)
9. C6 Saloon (TD_)
10. XJ (X350, X358)
11. XJ Saloon (X350, X358)
12. XJ ESPORTIVO (X350, X358)
13. 407 Coupe (6C_)
14. 407 (6D_)
15. 407 Saloon (6D_)
16. 407 SW (6E_)
17. C5 III (RD_)
18. C5 III Saloon (RD_)
19. C5 III Break (RW_)
20. XJ (X351)
21. See more in applications

The principle of the thermostat work

The classic VEMO 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.