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. 1502-2002 (E10)
2. 1502-2002 Saloon (E10)
3. 1502-2002 Convertible (E10)
4. 1500-2000 (115, 116, 118, 121)
5. 1500-2000 Saloon (115, 116, 118, 121)
6. 3 (E21)
7. 3 Saloon (E21)
8. 3 (E30)
9. 3 Saloon (E30)
10. 5 (E12)
11. 5 Saloon (E12)
12. 5 (E28)
13. 5 Saloon (E28)
14. 1502-2002 Touring (E6)
15. 1600 GT Coupe
16. 2000 Coupe (120)
17. 3 Convertible (E30)
18. 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.