Thermostat, coolant - 819837 VALEO

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. 124 Spider (124_)
2. SPIDEREUROPA (DS)
3. RITMO (138_)
4. STRADA (138_)
5. RITMO (138A_)
6. STRADA (138A_)
7. 131 (131_)
8. SUPERBRAVO (131_)
9. 131 Familiare/Panorama (131_)
10. 132 (132_)
11. 132 Saloon (132_)
12. ARGENTA (132_)
13. ARGENTA Saloon (132_)
14. TREVI (828_)
15. BETA H.P.E. (828_)
16. RONDA (022A)
17. 124 Coupe (124_)
18. 124 (124_)
19. 124 Saloon (124_)
20. RITMO Convertible (138_)
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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.