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 Grandtour (KZ0/1)
2. GRAN TOUR III Grandtour (KZ0/1)
3. MEGANE III Hatchback (BZ0/1_, B3_)
4. CUBE (Z12)
5. SCENIC III (JZ0/1_)
6. GRAND SCENIC III (JZ0/1_)
7. CLIO III Hatchback Van (SB_, SR_)
8. KANGOO BE BOP (KW0/1_)
9. NOTE (E11, NE11)
10. MEGANE II (BM0/1_, CM0/1_)
11. SCENIC II (JM0/1_)
12. MEGANE II Saloon (LM0/1_)
13. MEGANE II Estate (KM0/1_)
14. MEGANE II Grandtour (KM0/1_)
15. MEGANE II Sport Tourer (KM0/1_)
16. GRAND SCENIC II (JM0/1_)
17. MODUS / GRAND MODUS (F/JP0_)
18. CLIO III (BR0/1, CR0/1)
19. EURO CLIO III (BR0/1, CR0/1)
20. CLIO CAMPUS III (BR0/1, CR0/1)
21. See more in applications

The principle of the thermostat work

The classic METZGER 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.