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. DEDRA (835_)
2. DELTA II (836_)
3. DELTA Mk II (836_)
4. TEMPRA (159_)
5. TEMPRA S.W. (159_)
6. TEMPRA SW (159_)
7. PUNTO Convertible (176_)
8. PUNTO (176_)
9. DEDRA SW (835_)
10. JUMPY (U6U_)
11. DISPATCH (U6U_)
12. SCUDO Bus (220_)
13. EXPERT (224_)
14. EXPERT Van (222)
15. EXPERT Platform/Chassis (223)
16. SCUDO Van (220_)
17. JUMPY Van (BS_, BT_, BY_, BZ_)
18. DISPATCH Van (BS_, BT_, BY_, BZ_)
19. PALIO (178_)
20. SIENA (178_, 172_)
21. 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.