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. CX I (MA)
2. CX � (MA)
3. CX II
4. CX I Break (MA)
5. CX � Break (MA)
6. CX II Break
7. CX Mk II Break
8. C25 Bus (280_, 290_)
9. J5 Bus (280P)
10. J5 Platform/Chassis (280L)
11. J5 Bus (290P)
12. J5 Platform/Chassis (290L)
13. J5 Van (290L)
14. DUCATO Van (280_)
15. C25 Van (280_, 290_)
16. C25 Platform/Chassis (280_, 290_)
17. J5 Van (280L)
18. See more in applications

The principle of the thermostat work

The classic VALEO 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.