THERMOSTAT COOLANT FOR LANCIA DEDRA/SW DELTA/II/Mk ALFA ROMEO 155 145 146 AR VALEO 820407

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. 155 (167_)
2. DEDRA (835_)
3. TEMPRA (159_)
4. TEMPRA S.W. (159_)
5. TEMPRA SW (159_)
6. 145 (930_)
7. DELTA II (836_)
8. DELTA Mk II (836_)
9. DEDRA SW (835_)
10. 146 (930_)
11. AR 6 Bus (280_)
12. AR 6 Van (280_)
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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.