THERMOSTAT COOLANT FOR RENAULT 18/Variable/Break 20 21/Savanna 25 TRAFIC/Bus 21 SASIC 3371641

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. 18 (134_)
2. 18 Saloon (134_)
3. 18 Variable (135_)
4. 18 Break (135_)
5. 20 (127_)
6. 21 (B48_)
7. 21 Saloon (L48_)
8. 21 Estate (K48_)
9. 21 Savanna (K48_)
10. 25 (B29_)
11. TRAFIC Bus (T5, T6, T7)
12. TRAFIC Bus (TXW)
13. ESPACE II (J/S63_)
14. ESPACE Mk II (J/S63_)
15. VISA
16. BX (XB-_)
17. BX Break (XB-_)
18. C15 Van (VD_)
19. 205 II (20A/C)
20. 205 Mk II (20A/C)
21. See more in applications

The principle of the thermostat work

The classic SASIC 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.