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. E-CLASS T-Model (S211)
2. E-CLASS (W211)
3. E-CLASS Saloon (W211)
4. V-CLASS (638/2)
5. VITO Bus (638)
6. VITO Van (638)
7. SPRINTER 2-t Bus (901, 902)
8. SPRINTER 3-t Bus (903)
9. SPRINTER 2-t Van (901, 902)
10. SPRINTER 2-t Platform/Chassis (901, 902)
11. SPRINTER 3-t Van (903)
12. SPRINTER 3-t Platform/Chassis (903)
13. SPRINTER 4-t Platform/Chassis (904)
14. SPRINTER 4-t Van (904)
15. GRAND CHEROKEE II (WJ, WG)
16. GRAND CHEROKEE Mk II (WJ, WG)
17. GRAND CHEROKEE II SUV (WJ, WG)
18. C-CLASS (W203)
19. C-CLASS Saloon (W203)
20. C-CLASS T-Model (S203)
21. See more in applications

The principle of the thermostat work

The classic EPS 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.