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. PASSAT (3A2, 35I)
2. SHARAN (7M8, 7M9, 7M6)
3. GALAXY (WGR)
4. LT 28-35 I Bus (281-363)
5. LT28-50 � Bus (281-363)
6. LT 28-35 I Van (281-363)
7. LT28-50 � Van (281-363)
8. LT 28-35 I Platform/Chassis (281-363)
9. LT28-50 � Platform/Chassis (281-363)
10. V-CLASS (638/2)
11. LT 40-55 I Van (291-512)
12. LT 40-55 I Platform/Chassis (293-909)
13. VENTO (1H2)
14. VENTO Saloon (1H2)
15. JETTA III (1H2)
16. GOLF III (1H1)
17. GOLF Mk III (1H1)
18. SHARAN VAN (7M_)
19. See more in applications

The principle of the thermostat work

The classic FEBI BILSTEIN 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.