Thermostat, coolant - 820285 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. C3 I (FC_, FN_)
2. XSARA PICASSO (N68)
3. 308 I (4A_, 4C_)
4. 207 Saloon
5. 207 PASSION Saloon
6. 307 (3A/C)
7. 207 (WA_, WC_)
8. 207/207+ (WA_, WC_)
9. 206 CC (2D)
10. 206 Hatchback (2A/C)
11. BERLINGO / BERLINGO FIRST MPV (MF_, GJK_, GFK_)
12. BERLINGO MPV (MF_, GJK_, GFK_)
13. PARTNER MPV (5_, G_)
14. PARTNER ESCAPADE MPV (5_, G_)
15. PARTNER (5_, G_)
16. RANCH MPV (5_, G_)
17. GRAND RAID MPV (5_, G_)
18. PARTNER PATAGONICA / URBANA MPV (5_, G_)
19. 307 SW (3H)
20. 206 SW (2E/K)
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.