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. V-CLASS (638/2)
2. VITO Bus (638)
3. VITO Van (638)
4. SPRINTER 2-t Bus (901, 902)
5. SPRINTER 3-t Bus (903)
6. SPRINTER 2-t Van (901, 902)
7. SPRINTER 2-t Platform/Chassis (901, 902)
8. SPRINTER 3-t Van (903)
9. SPRINTER 3-t Platform/Chassis (903)
10. SPRINTER 4-t Bus (904)
11. SPRINTER 4-t Platform/Chassis (904)
12. SPRINTER 4-t Van (904)
13. GRAND CHEROKEE II (WJ, WG)
14. GRAND CHEROKEE Mk II (WJ, WG)
15. GRAND CHEROKEE II SUV (WJ, WG)
16. C-CLASS (W203)
17. C-CLASS Saloon (W203)
18. C-CLASS T-Model (S203)
19. VIANO (W639)
20. V-CLASS (W639)
21. See more in applications

The principle of the thermostat work

The classic METZGER 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.