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. DS3
3. C4 PICASSO I MPV (UD_)
4. C4 GRAND PICASSO I (UA_)
5. 207 (WA_, WC_)
6. 207/207+ (WA_, WC_)
7. 207 CC (WD_)
8. 308 I (4A_, 4C_)
9. 308 SW I (4E_, 4H_)
10. 308 SW I Estate (4E_, 4H_)
11. 308 CC (4B_)
12. C4 I (LC_)
13. C4 Coupe (LA_)
14. 3008 MPV (0U_)
15. 207 SW (WK_)
16. 207 SW Estate (WK_)
17. 5008 (0U_, 0E_)
18. RCZ
19. C5 III (RD_)
20. C5 III Saloon (RD_)
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The principle of the thermostat work

The classic CALORSTAT by Vernet 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.