THERMOSTAT COOLANT FOR MERCEDES-BENZ VITO/MIXTO/Van/Bus VALENTE VIANO V-CLASS HELLA 8MT 354 777-921

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. VITO / MIXTO Van (W639)
2. VITO Bus (W639)
3. VALENTE Bus (W639)
4. VIANO (W639)
5. V-CLASS (W639)
6. S-CLASS (W221)
7. S-CLASS Saloon (W221)
8. M-CLASS (W166)
9. M-CLASS SUV (W166)
10. GL-CLASS (X164)
11. GL-CLASS SUV (X164)
12. M-CLASS (W164)
13. M-CLASS SUV (W164)
14. R-CLASS (W251, V251)
15. E-CLASS T-Model (S212)
16. GL-CLASS (X166)
17. GL-CLASS SUV (X166)
18. S-CLASS (W222, V222, X222)
19. E-CLASS Convertible (A207)
20. E-CLASS Coupe (C207)
21. See more in applications

The principle of the thermostat work

The classic HELLA 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.