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. CLIO I (B/C57_, 5/357_)
2. LUTECIA I (B/C57_, 5/357_)
3. TWINGO I (C06_)
4. KANGOO (KC0/1_)
5. CLIO II (BB_, CB_)
6. CLIO Mk II (BB_, CB_)
7. LUTECIA II (BB_, CB_)
8. CLIO MIO II (BB_, CB_)
9. KANGOO Express (FC0/1_)
10. KANGOO Rapid (FC0/1_)
11. TWINGO I Hatchback Van (S06_)
12. TWINGO I Van (S06_)
13. CLIO II Hatchback Van (SB0/1/2_)
14. 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.