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. GS (_S16_)
2. GS Saloon (_S16_)
3. YARIS VERSO (_P2_)
4. YARIS VERSO / FUN CARGO (_P2_)
5. FUN CARGO (_P2_)
6. ECHO VERSO (_P2_)
7. AVENSIS Liftback (_T22_)
8. AVENSIS (_T22_)
9. AVENSIS Estate (_T22_)
10. RX (MCU15)
11. RX SUV (MCU15)
12. YARIS (_P1_)
13. ECHO (_P1_)
14. YARIS/VITZ (_P1_)
15. VITZ/ECHO (_P1_)
16. AVENSIS VERSO (_M2_)
17. VERSO SPORTVAN (_M2_)
18. IPSUM (_M2_)
19. PICNIC (_M2_)
20. RAV 4 II (_A2_)
21. See more in applications

The principle of the thermostat work

The classic JAPANPARTS 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.