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. A6 (4G2, 4GC, C7)
2. A6 / S6 (4G2, 4GC, C7)
3. TOUAREG (7P5, 7P6)
4. TOUAREG SUV (7P5, 7P6)
5. A8 (4H2, 4H8, 4HC, 4HL)
6. A8 / S8 (4H2, 4H8, 4HC, 4HL)
7. A8L (4H2, 4H8, 4HC, 4HL)
8. A7 Sportback (4GA, 4GF)
9. A7 / S7 Sportback (4GA, 4GF)
10. A6 Avant (4G5, 4GD, C7)
11. A5 (8T3)
12. A5 / S5 (8T3)
13. A6 (4F2, C6)
14. A6 Saloon (4F2, C6)
15. A6 / S6 (4F2, C6)
16. A6 Avant (4F5, C6)
17. A5 Sportback (8TA)
18. A5 / S5 Sportback (8TA)
19. A4 (8K2, B8)
20. A4 Saloon (8K2, B8)
21. See more in applications

The principle of the thermostat work

The classic TOPRAN 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.