THERMOSTAT COOLANT FOR RENAULT 18/Variable/Break 20 30 25 FUEGO ESPACE/I JEEP VALEO 819891

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 Variable (135_)
2. 18 Break (135_)
3. 20 (127_)
4. 30 (127_)
5. 25 (B29_)
6. FUEGO (136_)
7. ESPACE I (J11_)
8. ESPACE � (J11_)
9. TRAFIC Bus (TXW)
10. SAFRANE I (B54_)
11. SAFRANE � (B54_)
12. A310
13. 18 (134_)
14. 18 Saloon (134_)
15. TRAFIC Platform/Chassis (P6)
16. TRAFIC Rodeo (P6)
17. TRAFIC Bus (T5, T6, T7)
18. TRAFIC Van (TXX)
19. TRAFIC Van (T1, T3, T4, T2)
20. MASTER I Van (T__)
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.