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. 306 Hatchback (7A, 7C, N3, N5)
2. 306 (7B, N3, N5)
3. 306 Saloon (7B, N3, N5)
4. BERLINGO / BERLINGO FIRST Box Body/MPV (M_)
5. BERLINGO Box Body/MPV (M_)
6. 106 II (1A_, 1C_)
7. 306 Convertible (7D, N3, N5)
8. BERLINGO / BERLINGO FIRST MPV (MF_, GJK_, GFK_)
9. BERLINGO MPV (MF_, GJK_, GFK_)
10. C3 I (FC_, FN_)
11. PARTNER Box Body/MPV (5_, G_)
12. PARTNER Van (5_, G_)
13. RANCH Box Body/MPV (5_, G_)
14. PARTNER FURGON Box Body/MPV (5_, G_)
15. PARTNER MPV (5_, G_)
16. PARTNER ESCAPADE MPV (5_, G_)
17. PARTNER (5_, G_)
18. RANCH MPV (5_, G_)
19. GRAND RAID MPV (5_, G_)
20. PARTNER PATAGONICA / URBANA MPV (5_, G_)
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The principle of the thermostat work

The classic BorgWarner (Wahler) 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.