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. C4 II (B7)
2. 508 I (8D_)
3. 508 SW I (8E_)
4. SCUDO Van (270_, 272_)
5. SCUDO Bus (270_, 272_)
6. SCUDO MPV (270_, 272_)
7. GRAND C-MAX (DXA/CB7, DXA/CEU)
8. MONDEO IV Turnier (BA7)
9. MONDEO IV (BA7)
10. C8 (EA_, EB_)
11. 807 (EB_)
12. S-MAX (WA6)
13. DS4 (NX_)
14. C4 PICASSO I MPV (UD_)
15. C4 GRAND PICASSO I (UA_)
16. C-MAX II (DXA/CB7, DXA/CEU)
17. FOCUS III Saloon
18. FOCUS III
19. FOCUS III Turnier
20. DS5
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.