Thermostat, coolant - 4256.80D BorgWarner (Wahler)

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. 100 (C1)
2. 100 Saloon (C1)
3. GOLF I (17)
4. RABBIT I (17)
5. GOLF � (17)
6. CARIBE I (17)
7. K 70 (48)
8. PASSAT (32)
9. DASHER (32)
10. SCIROCCO (53)
11. TRANSPORTER III Platform/Chassis
12. TRANSPORTER T3 Platform/Chassis
13. PASSAT Variant (33)
14. DASHER Variant (33)
15. PASSAT Estate (33)
16. TRANSPORTER III Van
17. VANAGON III Van
18. TRANSPORTER T3 Van
19. JETTA I (16)
20. JETTA I Saloon (16)
21. See more in applications

The principle of the thermostat work

The classic BorgWarner (Wahler) 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.