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. 5008 (0U_, 0E_)
5. DS4 (NX_)
6. C4 PICASSO I MPV (UD_)
7. C4 GRAND PICASSO I (UA_)
8. C3 PICASSO (SH_)
9. BERLINGO MULTISPACE (B9)
10. 208 I (CA_, CC_)
11. DS5
12. PARTNER TEPEE
13. GRAND RAID
14. PARTNER Box Body/MPV
15. GRAND RAID Box Body/MPV
16. BERLINGO Box Body/MPV (B9)
17. 308 SW I (4E_, 4H_)
18. 308 SW I Estate (4E_, 4H_)
19. DS3
20. 207 (WA_, WC_)
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.