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. IMPREZA Hatchback (GR, GH, G3)
2. IMPREZA Hatchback (GR, GH, G3, GE)
3. B3 Hatchback (GR, GH, G3)
4. LEGACY V Estate (BR)
5. LIBERTY V Estate (BR)
6. LEGACY V Station Wagon (BR)
7. XV (_GP_)
8. XV HATCH MEDIO (_GP_)
9. CROSSTREK / XV CROSSTREK (_GP_)
10. XV SUV (_GP_)
11. LEGACY IV Estate (BP)
12. LIBERTY IV Estate (BP)
13. LEGACY IV Station Wagon (BP)
14. OUTBACK (BL, BP)
15. OUTBACK Estate (BL, BP)
16. FORESTER (SH_)
17. FORESTER SUV (SH_)
18. LEGACY IV (BL)
19. LIBERTY IV Saloon (BL)
20. LIBERTY IV (BL)
21. See more in applications

The principle of the thermostat work

The classic HERTH+BUSS JAKOPARTS 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.