THERMOSTAT COOLANT FOR BMW 3/E91/Compact/E46/Convertible/E90/X/E8/SAV/E92 Z4 MAHLE ORIGINAL TM 18 105

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. 3 Touring (E91)
2. 3 Compact (E46)
3. 3 (E46)
4. 3 Saloon (E46)
5. 3 Coupe (E46)
6. 3 Touring (E46)
7. 3 Convertible (E46)
8. 1 (E81)
9. 3 (E90)
10. 3 Saloon (E90)
11. Z4 Roadster (E85)
12. X3 (E83)
13. X3 SAV (E83)
14. X1 (E84)
15. X1 SAV (E84)
16. X1 SUV (E84)
17. 1 Coupe (E82)
18. 1 Convertible (E88)
19. 3 Coupe (E92)
20. 1 (E87)
21. See more in applications

The principle of the thermostat work

The classic MAHLE ORIGINAL 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.