Thermostat, coolant - 820268 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. TRAFIC II Bus (JL)
2. PRIMASTAR Bus (X83)
3. PRIMASTAR Van (X83)
4. VIVARO A Platform/Chassis (X83)
5. MOVANO Dump Truck (X70)
6. VEL SATIS (BJ0_)
7. ESPACE III (JE0_)
8. ESPACE Mk III (JE0_)
9. MOVANO Bus (X70)
10. MOVANO Van (X70)
11. MOVANO Platform/Chassis (X70)
12. MASTER II Bus (JD)
13. MASTER II Van (FD)
14. MASTER II Platform/Chassis (ED/HD/UD)
15. LAGUNA II (BG0/1_)
16. LAGUNA II Grandtour (KG0/1_)
17. LAGUNA II Sport Tourer (KG0/1_)
18. MOVANO Mk I (A) Combi (X70)
19. MOVANO Mk I (A) Van (X70)
20. MOVANO Mk I (A) Chassis/Cab (X70)
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.