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. MEGANE III Hatchback (BZ0/1_, B3_)
2. SCENIC III (JZ0/1_)
3. GRAND SCENIC III (JZ0/1_)
4. KANGOO BE BOP (KW0/1_)
5. MEGANE II (BM0/1_, CM0/1_)
6. SCENIC II (JM0/1_)
7. MEGANE II Estate (KM0/1_)
8. MEGANE II Grandtour (KM0/1_)
9. MEGANE II Sport Tourer (KM0/1_)
10. MEGANE II Saloon (LM0/1_)
11. MODUS / GRAND MODUS (F/JP0_)
12. CLIO III (BR0/1, CR0/1)
13. EURO CLIO III (BR0/1, CR0/1)
14. CLIO CAMPUS III (BR0/1, CR0/1)
15. LUTECIA III (BR0/1, CR0/1)
16. NOTE (E11, NE11)
17. MEGANE II Coupe-Cabriolet (EM0/1_)
18. QASHQAI / QASHQAI +2 I (J10, NJ10, JJ10E)
19. DUALIS I (J10, NJ10, JJ10E)
20. MICRA III (K12)
21. See more in applications

The principle of the thermostat work

The classic BorgWarner (Wahler) 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.