THERMOSTAT COOLANT FOR TOYOTA HIACE/III/Bus/IV/MPV/COMMUTER/Van/SBV/Pickup 4 VALEO 820174

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. TARO
2. HIACE III Bus (_H5_, _H6_, _H7_, _H8_, _H9_)
3. LAND CRUISER (_J7_)
4. CAREVACA (_J7_)
5. LAND CRUISER PRADO (_J7_)
6. LAND CRUISER Hardtop (_J7_)
7. LAND CRUISER FRP Top (_J7_)
8. HILUX V Pickup (_N_, KZN1_, VZN1_)
9. PICKUP V Pickup (_N_, KZN1_, VZN1_)
10. TACOMA V Pickup (_N_, KZN1_, VZN1_)
11. HILUX MIGHTY X V Pickup (_N_, KZN1_, VZN1_)
12. HIACE IV Bus (_H1_)
13. REGIUS IV Bus (_H1_)
14. HIACE IV MPV (_H1_)
15. DYNA IV Bus (_H1_)
16. HIACE / COMMUTER IV Bus (_H1_)
17. QUANTUM IV Bus (_H1_)
18. CRESSIDA Saloon (_X6_)
19. CRESSIDA Saloon (MX62, _X6_)
20. HIACE IV Bus (__H1_, __H2_)
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.